Generally speaking, where are the most immigrants from China in the United States?

Among Chinese in the United States, elderly Chinese or Chinese who have lived in the United States for generations take Cantonese as the absolute first. Most of the China people who immigrated to the United States in recent decades are illegal immigrants from Guangdong and Fujian, and most of them come from all over the world, mostly from big cities (just like the family background of college students in China).