Hyperbolic comparisons to slavery aside, the fact remains that it is unConstitutional to enact measures directed strictly at national and religious groups. The vetting process the US had in place met the security needs of the country as evidenced by the fact no immigrants had committed terror attacks since 911 (and 911 was committed primarily by Saudis which isn't on Trump's list). 

This is bigotry pure and simple and aimed only at inflaming hatred towards Muslims. It's meant to move the bars for acceptable mistreatment of people. Next up is boxcars heading to the camps.