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.
Teach US History. Slavery was the most important and divisive issue in 19th-century American politics and society. At the end of the Revolution, the new American nation was divided between the southern states whose economies were heavily dependent on slavery and northern states where slavery was legal but not economically important.