The Zionist movement started organised mass immigration of Jews from Europe to Palestine in 1880 at which time Jews made up 3%* of the population of Palestine, roughly the exact same percentage of the UK and US population that Muslims currently make up. I'm wondering how the American and British populations would react if over the next half century there was a massively-funded movement to encourage the mass immigration of Muslims to America and Britain, whereupon they would set up terrorist groups with which the help of Muslim superpower countries would over the next few decades take over 80% of America/Britain, and then spend the decades afterwards militarily occupying the other 20% while seizing more and more of the 20% to build Muslim settlements on. I wonder what the reaction of the existing American/British populations would be.

*And it had been at or around the 3% level going back centuries to when the first organised records records were made in the 1400s.