Neptune's windy atmosphere in August 1989. The ice giant Neptune was the first planet located through mathematical predictions rather than through regular observations of the sky.
well slavery was an big issue because it separated the northern and southern states. the northern states realize that slavery was an unnessary inhumane treatment and wanted to abolished it. While the southern states depended on slaves since they worked for free on their plantation. To resolve this they counted 3 free men for 5 slaves until 1808.
Debate over Slavery at the Constitutional Convention, August 21-22, 1787. By the 1830s, slaveowners told opponents of slavery that the Constitution protected slavery, representatives from the slave states would never have signed it otherwise, and everyone at the Constitutional Convention knew it.