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.
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.