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.
It dealt with slavery and the issue of including them into the  population of Southern states.   The Three-Fifths Compromise settled the issue of how slaves would  be counted in terms of congressional representation and how the  state would be taxed.