In 1860, the election of Abraham Lincoln as President on a program of limiting slavery led to the secession of Southern States and the outbreak of the US Civil War.
http://www.answers.com/Q/Which_amendment_ended_slavery_in_the_united_states
69 Contributions. The 13th Amendment abolished slavery and was passed around the end  of the Civil War (passed January 31, 1865; adopted December 6,  1865).
http://www.answers.com/Q/Which_amendment_ended_slavery_in_the_united_states
Section 1 of the 13 th Amendment says: Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.
http://www.blackhistory.com/content/60916/13th-14th-and-15th-amendments
The Constitution that the delegates proposed included several provisions that explicity recognized and protected slavery. Without these provisions, southern delegates would not support the new Constitution--and without the southern states on board, the Constitution had no chance of being ratified.
http://law2.umkc.edu/faculty/projects/ftrials/conlaw/thirteenthamendment.html
The 13th amendment put an end to slavery in the United States. This  amendment also ended involuntary servitude and was passed in 1865.
http://www.answers.com/Q/Which_amendment_ended_slavery_in_the_united_states
Slavery was ended one and for all with the ratification of the 13th amendment to the Constitution in December of 1865.   Michael Montagne. 21 people found this useful. 1  History of the American Slave Trade Despite its claim to be a freedom-loving nation, the United States allowed slavery for nearly 250 years.
http://www.answers.com/Q/Which_amendment_ended_slavery_in_the_united_states
The Thirteenth Amendment, unlike most provisions in the Constitution, is self-executing, in that it directly reaches-even without action by Congress-conduct by private individuals (slave holders).
http://law2.umkc.edu/faculty/projects/ftrials/conlaw/thirteenthamendment.html
Introduction Delegates to the Constitutional Convention of 1787 hotly debated the issue of slavery. George Mason of Virginia argued eloquently against slavery, warning his fellow delegates: Every master of slaves is born a petty tyrant. They bring the judgment of heaven on a country.
http://law2.umkc.edu/faculty/projects/ftrials/conlaw/thirteenthamendment.html
Slavery, as all students of history know, continued to be a divisive issue up through the Civil War. Southern states worried that the balance in Congress might tip against slavery, and so were anxious to extend slavery to new territories and states.
http://law2.umkc.edu/faculty/projects/ftrials/conlaw/thirteenthamendment.html
The Amendment was understood to also make blacks citizens of the United States (overruling Dred Scott on that point). The House vote to propose the Thirteenth Amendment followed the Senate vote, and barely made the 2/3 majority requirement.
http://law2.umkc.edu/faculty/projects/ftrials/conlaw/thirteenthamendment.html
which amendment to the constitution ended slavery in the united states
Neither slavery nor involuntary servitude and except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States.