Idon't understand this

create a top five list of events related to westward expansion that affected african americans.
choose from the following:
• missouri compromise
• compromise of 1850
• kansas-nebraska act
• dred scott v. sandford
• fugitive slave act
• nat turner's rebellion
• bleeding kansas
• harpers ferry

[write with complete sentences why this event had the greatest impact on african americans as the country expanded west]