Nice hyperbole.
At what point are the borders "closed"? Big fence? Border ninjas? Bio-dome?
Who, exactly, are the borders "ruining this country" for?
What is your definition of "overrun"? 1 person? 10? A certain percentage?
AZ, TX, and CA get a lot of snowbirds every winter. Are they included in your "invaders"? They're big users of government entitlement programs, yet pay only a fraction of the taxes that people who live and work there full time do.