Paris proposed a unified government within the French Union under the former Annamite emperor, Bao Dai. Cochin-China and Annam accepted the proposal, and Bao Dai was proclaimed emperor of all Vietnam in 1949. Ho and the Vietminh withheld support, and the revolution in China gave them the outside help needed for a war of resistance against French and Vietnamese troops armed largely by a United States worried about cold war Communist expansion