Who make the last decree on approving a green card?

In what agency are they approved and by whom?
Answers:   
Normally, it's all handled by US Citizenship and Immigration Services, a division of the Department of Homeland Security.
The person applying for it. The Immigration is a short time ago an instrument of the government as to measure the capability of an alien by vehicle of its productivity and contribution to the society and of course the FBI who tracks down your record which is one of the big determining factor of the Immigration officer to either approve or deny a being for the green card.

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