"Alleged militants in the War on Terror who have lived in United States"
Using this:
https://en.wikipedia.org/wiki/Template:AmericanTerrorism
I decided to look at how many known terrorists who were in the US actually decided to waltz up from the Mexico border, and this is what I got...
In US:
-Naturalized: IIIII IIIII IIIII IIIII (20)
-Born to presumably naturalized citizens: IIIII IIIII IIIII II (17)
-Born to born-citizens (No questions of citizenship): IIIII IIIII IIIII IIIII IIIII III (28 - Also includes converts, an alt-righter, and a "John Wayne wannabe" )
-Citizenship status but not specified how it was obtained: IIIII (5)
-Legal immigrant/resident: IIIII III (8)
-Arrived via plane: IIIII IIIII IIIII IIIII III (23 - Came into the US to do the attack or came in and left. Includes the 9/11 hijackers)
-Illegally came up from southern border: III (3 - Who came into the US as children in the 1980s)
Never in US, except as in detention: II (2)
Where are the thousands we're supposedly catching?
