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Hello!
The purchase of insurance to the United States depends mainly on your personal situation, you can buy at home, you can also go to the United States and then buy. However, the foreign medical insurance has a certain effective time, you'd better buy a suitable foreign insurance in the country before traveling, as a temporary protection.
As for which insurance company to choose when traveling to the U.S., there is no special requirement, we suggest that you can go to the multi-policy fish to choose a professional protection of the U.S. travel abroad travel insurance. The company has a large number of overseas travel insurance products from many famous domestic and foreign insurance companies, including AIGA, Allianz, Ping An, and Pacific Ocean, etc. You can freely compare and choose the right insurance products for yourself.
I hope this helps you!