It is a small percent now, not sure about the future.
Honestly I feel like what I am reading in the News lately was close to the last days of the Roman Empire.
They had tribes come over the borders and demand things, we have Mexicans come over the borders and demand things.
They saw their military become less and less dependable as it became more and more barbarian membership. Our barbarians is now just causing problems at the squad and company level. How long before we have Divisions of nothing but gangbangers?