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The White House warns in a stark new National Security Strategy that Europe could be “unrecognizable in 20 years or less” due to mass migration, adding that the demographic shift raises doubts about future U.S. allies on the continent.

“Should present trends continue, the continent will be unrecognizable in 20 years or less,” the 33-page document released on Thursday reads.

It adds that the “real and more stark prospect” is of “civilizational erasure.”

Mass immigration has been one of Europe’s most volatile political flashpoints over the past decade, fueled by repeated waves of immigrants from the Middle East, Africa and South Asia.

TRUMP HIGHLIGHTS FEDERAL LAW GRANTING PRESIDENTIAL POWER TO HALT IMMIGRATION AS CRACKDOWN ESCALATES

“As such,

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