How many United States presidents served in the American Civil War?
7
1
2
1
2
4
1
2
4
3
1
2
4
3
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
0
2
4
3
5
1
2
4
3
0
5
1
2
4
3
5
0
1
2
4
3
5
1
0
2
4
3
5
6
1
2
4
3
0
5
6
1
2
4
3
5
6
1
2
4
3
5
6
1
2
4
3
5
6
7
1
2
4
3
5
6
7
1
2
4
3
5
6
7
8
4
3
5
6
7
8
9
3
5
6
7
8
9
11
5
6
7
8
9
11
5
6
7
8
9
11
6
10
7
8
9
11
6
10
7
8
9
11
6
10
7
8
13
9
11
6
10
7
8
12
13
9
11
6
10
7
8
12
13
9
11
6
10
7
8
12
13
9
11
6
10
7
8
12
13
14
9
11
6
10
7
8
12
13
62
66
62
61
66
62
58