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