How many U.S. states were admitted to the Union during the 1840's?
4
5
3
5
4
3
2
5
4
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
6
1
3
2
7
5
4
6
1
3
2
7
5
4
6
1
3
13
8
2
7
12
5
4
6
1
3
13
8
2
7
12
10
5
4
9
6
1
3
11
13
8
2
7
12
10
5
4
9
6
1
3
11
13
8
2
7
12
10
5
4
9
6
1
3
11
13
8
2
7
12
10
5
4
9
6
1
3
11
13
8
16
2
7
12
10
5
4
9
6
1
3
11
17
13
8
16
2
7
12
10
5
4
9
6
1
3
11
14
17
13
8
16
2
7
12
10
5
4
9
6
1
3
11
14
17
13
8
16
2
7
12
10
5
4
9
6
1
3
11
14
17
13
8
16
2
7
12
10
4
9
6
1
11
14
17
2 states
4 states
5 states
3 states
12 states
2 states
13 states