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The first american slaves arrived in Virginia.
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Slavery is made illegal in the north west territory the U.S consituation states that congress may not ban the slave trade in 1808
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A federal fugitive slave law is enacted providing for the return slaves who had escaped and crossed state lines.
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Congress bans the importation of slaves from africa.
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The Missouri compromise bans slavery north of the southern boundary of Missouri.
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The slave population in u.s numbers more than two million, making the ratio of free 5.5:1
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Texas enters the union as a slave state.
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The slave population is now nearly four million, making the ratio of free to enslaved Americans approximately 7:1.
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President Lincoln issues the emancipation, proclamation, declaring that "all persons held as slaves" within the confederate state "are and henceforward shall be free