“Introduction to Homeland Security”, how does terrorism tie in with Border Security?

“Introduction to Homeland Security”, how does terrorism tie in with Border Security? (Be specific and cite sources… merely saying keeping out terrorists will keep us safe will earn you a zero). the first line of your post must contain the text book if possible use Border SecurityAuthor(s): Phelps, Dailey, & KoenigsbergPublisher: Carolina Academic PressYear: 2014If not.. then try to find a book similar for use of citations.Chicago Style