Closed borders? Look at the countries that have tried it. Do we really want that sort of fascist/socialist state here? Unchecked immigration is guaranteed to give us national socialism delivered through the democrat's well oiled vote fraud machinery. Call the solution a closed border, or a closed society, this invasion has to be repelled or we're done for.
I'd be more impressed if it weren't for the fact that 99% of the "closed borders" crowd is only concerned with closing the border with Mexico. Apparently the thousands of Europeans who sneak in here every year and compete directly for middle class jobs aren't as abhorrent as the Mexicans who mostly don't.
The same crap, about "losing our culture", was bandied about when the Irish and the Italians immigrated in large numbers. It never happened, if you haven't noticed.