US banned immigrants 6 times in 200 years before Trump's ban
The US had banned Chinese labourers from entering the country in 1882 to combat unemployment and Jewish refugees during World War II for allegedly posing a threat. Anarchists and political extremists were blocked from entering the country in 1903, while all Communist Party immigrants were deported in 1950. The US disallowed Iranians and HIV-positive persons in 1980 and 1987 respectively. 