Which 2 slave states bordered the free state of lllinois?
Missouri and Kentucky
For those who don't recognize the various states, let's walk through the states in question. First look at the yellow states in the middle of the map - the one on the left is Missouri and the one on the right is Kentucky. The two come together to a near point and that blue state that nestles in there is Illinois.
The border between Illinois and Missouri and also between Missouri and Kentucky is the Mississippi River. The border between Illinois and Kentucky is the Ohio River.