In the early 20th century and late 1900s; A complicated piece of legislation, it essentially gave preference to immigrants from Central, Northern and Western Europe, severely limiting the numbers from Russia and Southern Europe, and declared all potential immigrants from Asia unworthy of entry into the United States.
I hope this helped ://
Conventions are meeting that delegates have one famous convention is the constitutional convention. And if your talking about the fun conventions like the science ones or beauty conventions those are like party anyone is invited to