What did the fugative slave act require all americans to do?
1vote to end slavery
2send slaves to africa
3keep at least 3 slaves
return runaway slaves

The answer is 4, Help return runaway slaves.

Explanation:

We can use the process of elimination here. Lets start with 1.

1)To end slavery, that was the Emancipation Proclamation, and even then, not all Americans did not vote for it. (The South)

2) Not this one, since why would all of a sudden, the Americans, aka the South, would return what is making their profits. Remember, the South made their money off of cash crops.

3) The North supported anti-Slavery, and by the issuing of the Emancipation Proclamation, President Lincoln opposed slavery. So why keep at least 3 slaves if half of the country and the commander in chief disagrees with it?

4) This is the one. Slaves began to run away after the Emancipation Proclamation. The South said that this was unfair, so they passed the Fugitive Slave Act. They even gave a cash reward to those who did return it. Since the slaves were escapees, they were considered fugitives by violating the Act. but the North ignored this rule, sheltering the former slaves. So for the most part, this Act affected mostly the South.  

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!

d. dr. francis collins