The fugitive slave act and the Dredd Scott Decision preceeded the sesession of the southern states.
Britain wanted control over the Suez Canal because it was the shortest naval route between Europe and Asia.
I'm going to list the options from 1-7 and the groups 1-4
1 will go into 1.
2 would go into 2
3 would go into 3
4 would go into 4
5 would go into 4
6 would go into 3
7 would go into 1 Hope that helps.