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Urgent! ! What do K 1, K3, CR 1 mean respectively?

K 1 is a visa for the fiancee of an American citizen to enter China.

K3 belongs to the citizen's wife.

The first two kinds of fast track are only available in the last two years.

CR 1 means that after marriage, immigrants can get a green card as long as they go through normal procedures.

After K3 goes, you need to change your identity and apply for a green card, which may be several months faster than CR 1. Usually about 3 months is not interesting, or CR 1 will do it slowly and save trouble.