How many Union states participated in the Civil War?
20
10
10
10
10
10
8
10
8
10
8
13
9
10
8
13
9
5
12
10
11
8
13
9
5
12
10
11
8
7
13
9
5
12
10
11
8
7
13
9
14
5
12
10
11
8
7
13
9
14
5
12
10
11
8
7
13
9
14
5
6
12
10
11
8
7
13
9
14
5
6
12
10
11
8
7
13
9
14
5
6
12
10
11
8
7
13
9
14
5
6
12
10
11
8
7
13
9
14
5
6
12
10
11
8
7
13
9
14
5
6
12
4
10
11
8
7
13
9
14
5
6
12
4
10
11
8
7
13
9
14
5
6
12
4
11
8
7
13
9
14
5
6
12
4
11
8
7
13
9
14
5
6
21
12
4
11
8
7
13
9
14
5
6
21
12
4
11
8
7
13
9
14
5
27
6
10 states
21
12
4
15
11
13 states
7
13
9
14
5
27
6
21
12
4
15
20
11
7
13
9
14
5