Lol. im lolling cuz the answer to ur question is included in ur Q. Try to go along the line of " Even though not all illegal immigrants are terrorist and some of those immigrants r decent people, bad boarder control can affect the national security of the country. And here is how...etc.."
PS I don't support helping ppl on their homeworks cuz it's their responsibility but I'm just recommending a topic/thesis to you.
