How many black presidents has the U.S. had?
1
2
2
2
2
2
2
1
2
1
2
1
2
1
2
1
2
1
2
1
3
2
4
1
3
2
4
1
3
2
4
1
3
2
4
1
3
2
4
1
3
2
4
1
5
3
2
4
1
5
3
2
4
1
5
3
4
1
5
3
4
1
5
3
4
1
5
3
0
4
1
5
3
4
0
1
5
3
4
5
0
3
4
5
3
0
4
5
3
4
0
5
3
4
5
0
3
7
4
9
5
3
0
7
4
9
5
6
7
0
9
5
6
7
9
5
0
6
7
9
5
6
7
9
5
6
7
13
9
5
6
8
7
13
9
6
8
7
13
9
6
8
7
13
9
6
8
7
13
9
6
8
7
13
9
6
8
7
13
11
9
6
8
7
13
11
12
9
6
8
7
13
11
14
12
9
6
8
7
13
11
14
12
9
6
8
10
7
13
11
14
12
9
6
8
10
7
13
11
14
9