How many U.S. states were admitted to the Union during the 20th century?
5
13
13
11
13
11
13
11
13
11
13
2
14
50
27
21
11
13
2
3
14
50
27
21
11
13
2
3
14
5
50
29
27
10
21
11
ten
13
2
3
14
5
9
50
29
27
10
21
11
13
2
3
14
5
9
ten
20
50
29
27
10
58
21
11
13
2
3
49
14
5
9
20
50
29
0
ten
27
117
10
21
11
13
2
3
49
14
5
58
76
4
9
12
69
20
50
29
27
10
0
21
1
11
ten
13
2
117
3
49
14
5
4
9
12
119
20
58
50
29
76
62
27
69
10
104
21
1
11
13
2
3
49
14
34
5
0
4
9
ten
12
117
61
15
20
50
29
7
27
19
119
10
58
76
21
62
1
11
13
2
3
69
49
14
34
104
5
4
9
12
15
20
50
29
0
7
ten
27
19
117
44
109
10
21
1
31
11
13
2
3
49
119
14
34
5
58
76
4
9
48
62
12
69