On the 15th of August 1947, the partition of British India caused the movement of 18 million people. This caused both religious and civil tensions between Hindus and Muslims. This resulted in the highest casualty rate for one migration according to the Guinness Book of World Records 2014. One million people were killed and 12 million became homeless.True, but in the past, it took centuries to grow. The Single Market changed all that.
Immigration shoots up from about 10% to 15%-20% in just one generation.