How many successful assassination attempts of US presidents have there been?
4
2
2
2
2
1
2
1
2
3
1
2
3
1
2
3
1
2
3
1
2
4
3
1
2
4
3
1
2
4
3
1
2
4
3
1
2
4
5
3
1
2
4
5
3
1
2
4
5
3
1
0
2
4
5
3
1
2
0
4
5
3
1
2
4
5
3
0
1
2
4
5
3
1
0
4
5
3
1
6
0
4
5
3
7
1
6
4
5
3
0
7
1
6
4
5
3
7
6
0
4
5
3
7
6
0
4
5
7
6
4
5
0
7
6
4
5
8
7
6
0
4
5
8
7
6
0
5
8
9
7
6
5
0
8
9
7
6
5
8
9
7
6
0
5
8
9
7
6
8
9
7
6
8
9
7
6
8
9
7
6
13
8
9
7
6
13
8
9
7
11
6
13
8
9
7
11
6
13
8
9
7
11
6
13
8
9
7
11
13
10
8
9
11
13
10
8
9
11
13
229