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Portuguese traded Africans with gold and salt. 11 million slaves crossed the Atlantic
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As many people opposed to slavery, the Pennsylvania Abolition Society was formed. https://www.pinterest.com/pin/513973376201531152/
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Massachusetts outlawed slavery http://rmc.library.cornell.edu/abolitionism/spread_word.htm
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The Missouri entered the United States as a slave state and Maine as a free state. https://www.pinterest.com/pin/514395588661806121/
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California admitted as a free state. As a compromise, a fugitive slave law requires runaway slaves to be returned to their owners.
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slavery would be left to popular vote in the territory http://www.latinamericanstudies.org/bleeding-kansas.htm
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Dred was a slave who was taken to a free state. He sued for his fight to freedom based on the fact that he had lived in a free state. The Supreme Court determined that he had no right to sue. http://atlantablackstar.com/2016/03/21/6-important-facts-you-may-not-have-known-about-the-landmark-case-dred-scott-v-sandford/
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Issued by President Abraham Lincoln. It freed slaves in southern states still in rebellion http://www.civilwar.org/education/history/emancipation-150/10-facts.html
