Citizens don't usually want new immigrants because it is considered that immigrants take the jobs away from them. Also, many new immigrants get some sort of benefits from the government; the US citizens pay taxes for those benefits
Naturalized citizens == ==
Almost all of them
About 6/1,000 citizens of Canada are immigrants.
Congress
Naturalization
Congress
No
Naturalization
No, they are citizens pure and simple.
Unless the US citizen is a Native American, all other US citizens are immigrants or descendants of immigrants. Native American make-up 1%-2% of the total US population.
Legal immigrants have to apply to the US government for permission to immigrate. Illegal immigrants sneak in.