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The American Civil War (1861-1865): Its Impact on
Slavery, and the Emergence of Slavery Abolition as Jus
Cogens in International Law
Introduction
The American Civil War (1861–1865) was a revolutionary development in American history
that had profound implications for both national and international legal systems. The war
brought an end to slavery by virtue of the Emancipation Proclamation (1863) and the
ratification of the Thirteenth Amendment (1865), providing a precedent for the protection of
human rights. Outside its home country's effects, however, the American Civil War has also
been significantly involved in codifying international law against slavery and eventually
leading towards its establishment as a jus cogens norm within international law. Jus cogens or
peremptory norms refer to base rules of international law from which no derogation can be
claimed, and being part of them, slavery represents evidence of its significant influence in
diplomatic and juridical history.
Slavery itself has long been a widely recognised institution that had been embedded within
legal and economic frameworks across various civilisations. However, abolitionist
movements by the 19th century began to challenge it, which resulted in the institution
declining unevenly but eventually over the globe. Through this research, the author seeks to
analyse the manner in which the American Civil War shaped the final determination of the
abolition of slavery as a jus cogens norm in international law—a fundamental principle from
which no exception is permissible.
This study aims to assess the extent to which the American Civil War influenced international
treaties, legal norms, and diplomatic relations regarding abolition of slavery.
The research will examine historical documents, constitutional provisions, and international
agreements to follow the ways in which the abolitionist campaign during the war influenced
the international perceptions. The result will add to the broader debate on the historical roots
of international human rights law, particularly the evolution of peremptory norms against
slavery and forced labour.
Research questions
The questions of relevance below are the central focus of this research:
1. How did the American Civil War contribute to the national and global abolition of
slavery?
2. What role did the Thirteenth Amendment play in creating the benchmark for future
global slavery-related legal advancements?
3. How did the war contribute to international law's categorization of slavery as a jus
cogens norm?
4. What were the diplomatic implications of the American Civil War for the evolution of
international anti-slavery conventions and treaties?
5. How do modern international legal regimes on slavery and forced labour continue to
be shaped by the Civil War?
Research Gaps
There are several gaps in the existing body of knowledge on the subject:
● The American Civil War is primarily researched as an internal conflict, with scant
consideration given to how it impacted international human rights norms.
● The impact of the war on international legal systems is not often considered in
research on the abolition of slavery as an anticipatory norm.
● There is limited research to associate the ratification of the Thirteenth Amendment
with the subsequent establishment of international treaties abolishing slavery.
● The diplomatic implications of the American Civil War in terms of forging
abolitionist societies throughout the world are yet unclear.
● This work shall address the gap and provide better insight into how the war impacted
international law.
Slavery, the Civil War, and the Global Legal Context
The status of slavery in the law had been a debated one in global law for a very long time.
While British Slavery Abolition Act of 1833 and similar movements in other countries of the
European continent had created precedents, the American Civil War presented a strong case
of abolition arising out of constitutional and war. As opposed to Britain, whose slavery was
brought to an end through legislation and economic change, the United States witnessed a
destructive conflict that entailed legal and constitutional change, presenting significant case
material on the mechanism whereby legal norms evolve with war.
The American Civil War has relevance further than in the United States owing to its role in
affecting worldwide legal consciousness concerning human rights, forced labour, and
international conventions of slave trade. The outcome of the war helped fuel diplomatic
negotiations regarding the protection of human rights and influenced early legal instruments,
such as the Brussels Conference Act of 1890, the 1926 Slavery Convention, and later treaties
banning forced labour and human trafficking. In the course of time, these legal tools helped
shape customary international law, leading to the establishment of abolition of slavery as a
peremptory norm (jus cogens) in contemporary international legal thought.
Theoretical Significance and Research Justification
Fewer studies comparatively have examined the impact of the American Civil War on
international law, even though its internal legal impact has been widely researched. The
majority of studies are concerned with the impact of the war in the US, including civil rights developments, constitutional reform, and Reconstruction policy. But abolitionist campaigns,
international law, and the establishment of human rights safeguards in the 20th century were
all affected greatly by the war. Through the analysis of how the war shaped international legal
systems that eventually came to categorize slavery as a non-derogable international norm,
this research hopes to fill this gap.
Secondly, this research incorporates critical legal theory, historical institutionalism, and
postcolonial legal studies to explore how international legal norms on slavery developed as a
reaction to such past conflicts as the Civil War. This study will scrutinize if abolitionist legal
ideas were indeed universal or if they existed to serve mainly the geopolitical agendas of
Western powers. Using Third World Approaches to International Law (TWAIL), this research
will also explore how the formerly colonized states engaged with and influenced post-Civil
War legal principles on slavery and forced labour.
Research Design and Methodology
The study uses an interdisciplinary methodology, combining intellectual history, critical legal
studies, archival research, and comparative legal analysis to analyse how the American Civil
War affected the abolition of slavery and its establishment as a jus cogens norm in
international law.
1. Textual Analysis
The speeches of Lincoln, the Thirteenth Amendment to the US Constitution in 1865, and the
Emancipation Proclamation issued in 1863 will be studied as first-hand legal instruments to
analyse how abolition was asserted as being both morally and legally necessary. How the
prohibition against slavery in international law evolved is to be tracked through analysing
international legal treaties and conventions like the 1956 Supplementary Convention and the
1926 Slavery Convention.
2. Doctrinal Analysis
The research will investigate legal principles regarding slavery, such as natural law theories,
customary international law, and early human rights doctrine, to review their evolution and
application. Case studies will cover Reconstruction era United States legislation, the British
Slavery Abolition Act (1833), and the Brussels Conference Act of 1890. Court judgments of
the ICJ, the European Court of Human Rights, and the ICC will be analysed to discern how
the courts enshrined slavery's prohibition in law.
3. Archival Research
Historical documents like treaties, diplomatic letters, war records, and parliamentary debates
will be analysed to determine the extent to which legal and political rhetoric influenced
abolitionist movements. U.S. National Archives, British colonial archives, and UN treaty
series will be used to track the war's impact on international legal standards.
4.Comparative Analysis
The study will contrast the Civil War's influence on abolition with other movements to note
differences in legal approaches and international impact. Case studies will encompass:British abolition of slavery (1833): A legislative model compared to the Civil War's military
and constitutional model. A Haitian slave revolt (1791–1804) set legal precedents for
freedom.
Colonial legal systems: How slavery was controlled and outlawed by European thought.
The research will also examine the influence of the movements on anti-slavery conventions
and UN treaties.
5. Critical Legal Analysis and Human Rights
Applying Third World Approaches to International Law (TWAIL) and critical legal theory,
the research will examine how power relations and colonial histories led to the international
legal abolition of slavery. TWAIL scholarship will determine whether abolitionist legal
structures served Western agendas primarily or indeed promoted human rights. In defining
international human rights standards, the research will further investigate how abolitionist
regimes following the Civil War engaged with former colonies and newly independent states.
This methodology guarantees a thorough, multidisciplinary, and critical approach to
comprehending the ways in which the Civil War impacted the final acceptance of slavery as a
peremptory norm and its ban in international law
In summary
The American Civil War was a turning point in the legal and moral history of human rights,
and so it was more than just an internal conflict. Its lasting effect was the establishment of
human rights treaties, customary international law, and the identification of abolition of
slavery as a peremptory norm, although its immediate effect was the ending of slavery in the
United States. This research seeks to provide a comprehensive understanding of how national
conflicts shape international legal norms by examining the impact of the Civil War on
international law from historical, legal, and critical perspectives.
By doing so, our study adds to the general debate on how history influences current
international law, the crossroads of domestic and international legal reforms, and the
continuous struggle against modern slavery and forced labour. It is necessary to understand
the legacy of the Civil War in the history of international law so that legal systems remain
actively resisting exploitation in all its forms and so better understanding can be achieved on
how human rights protections have evolved.
Literature review
S.
No
Author Year Title Research Finding Research Gap
1
James M.
McPherson 1988 Battle Cry of Freedom
Detailed account of the
Civil War and abolition of
slavery in the U.S.
Lacks focus on international
implications of the Civil War
on anti-slavery norms.
2
David Brion
Davis 2006
Inhuman Bondage:
The Rise and Fall of
Slavery
Global history of slavery
and abolition movements.
Does not link the Civil War to
global legal norms against
slavery.
3 Jean Allain 2013
Slavery in
International Law
Talks about slavery being a
jus cogens norm under
international law.
Does not analyse how the
Civil War contributed to this
evolution.
4
William A.
Schabas 2017
The Customary
International Law of
Human Rights
Examines development of
human rights as customary
international law.
Limited discussion on how
slavery transitioned to jus
cogens status due to the Civil
War.
5
Antony
Anghie 2005
Imperialism,
Sovereignty and the
Making of
International Law
Examines colonial origins
of international law and
implications for human
rights.
Does not discuss how the
American Civil War shaped
international legal principles
about slavery.
6 Eric Foner 2010
The Fiery Trial:
Abraham Lincoln and
Slavery
Explores Lincoln's
changing position on
slavery and how it affected
the Civil War.
Does not consider the wider
global consequences of
Lincoln's policies
7
Seymour
Drescher 2009
Abolition: A History of
Slavery and
Antislavery
Presents a general history
of abolition movements
globally.
Does not specifically address
how the Civil War impacted
international anti-slavery
efforts.
Keywords:
American civil war-jus cogens
Cite Article:
"The American Civil War (1861–1865): Its Impact on Slavery, and the Emergence of Slavery Abolition as Jus Cogens in International Law", International Journal for Research Trends and Innovation (www.ijrti.org), ISSN:2455-2631, Vol.10, Issue 5, page no.c209-c219, May-2025, Available :http://www.ijrti.org/papers/IJRTI2505221.pdf
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An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 8.14 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator