How many U.S. states were admitted to the Union during the 20th century?
5
5
5
3
5
2
3
4
5
2
3
4
5
2
1
3
4
5
2
1
3
4
5
2
1
3
4
5
2
1
3
4
5
6
2
1
3
4
5
13
6
10
2
7
1
3
4
12
5
11
0
13
6
10
2
7
1
3
4
16
12
5
11
13
9
6
10
2
0
7
1
3
4
16
12
5
11
13
8
9
6
10
2
7
1
3
0
4
16
12
5
11
66
13
8
9
6
10
2
7
1
3
4
16
12
62
5
11
0
13
8
9
6
10
2
66
7
1
3
17
4
16
12
5
14
11
13
8
9
6
62
10
2
0
7
1
63
3
17
66
4
16
12
5
14
11
20
13
8
9
6
10
2
7
1
62
3
17
0
63
4
16
12
5
14
11
20
66
13
8
25
9
6
10
2
7
1
3
17
4
16
12
62
5
14
11
20
0
13
8
63
25
9
6
10
2
26
66
7
1
3