How many U.S. states were admitted to the Union during the 1840's?
4
3
3
2
5
3
2
5
3
2
5
3
2
5
3
2
5
4
3
2
5
4
3
2
5
7
4
3
2
5
13
7
4
3
2
5
13
1
7
4
3
2
5
9
13
1
6
7
4
3
2
5
9
13
1
11
6
7
4
3
2
5
9
13
1
11
10
6
7
4
3
2
5
9
13
1
11
10
6
7
4
3
8
2
5
9
13
1
11
10
6
7
4
3
8
2
5
9
13
1
11
10
6
7
4
3
8
2
5
9
13
1
11
10
14
6
7
4
3
8
2
5
9
13
1
11
10
12
14
6
7
4
3
8
2
5
9
13
1
11
10
12
14
6
7
4
3
8
2
5
9
13
1
11
10
12
14
6
7
4
8
2
5
9
13
1
11
10
12
14
6
7
4
8
9
13
1
11
10
12
14
6
7
4
8
9
13
1
11
10
12
14
6
7
4
8
9
13
1
11
10