How many U.S. presidents owned slaves?
12
1
2
1
2
1
2
1
2
1
2
1
3
4
2
1
3
4
2
1
3
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
0
2
1
3
5
4
2
1
0
3
5
4
2
1
3
5
4
0
2
1
3
5
4
0
2
1
3
5
4
6
2
1
0
3
5
4
6
2
1
3
5
4
6
2
3
5
4
6
3
7
5
4
6
3
7
5
4
6
3
7
5
4
6
8
3
7
5
4
6
8
7
5
6
8
9
7
5
6
8
9
7
5
6
8
9
7
6
8
11
9
7
6
8
11
9
7
6
8
10
11
9
7
6
8
10
11
9
7
6
8
10
11
9
13
7
6
8
10
11
9
13
7
6
8
10
11
9
12
13
7
6
8
10
11
9
12
13
7
6
8
10
11
9
12
13
7
62
66
62
61
66
62
59
ONE