The difference is that a topic outline only consists of words and/or phrases, while a sentence outline consists of complete sentences.
Slavery ended when President Abraham Lincoln delivered his iconic Emancipation Proclamation. This would eventually free black people so they could become ordinary citizens and NOT slaves. So basically, slavery was ended all thanks to good ol' Lincoln :)
Congress
The house of representative and senate are tasked by the constitution to debate and approve all government spending in the spirit of checks and balances as enhanced by the principle of separation of power.