What type of Buddhism is popular in the united states? A. Theravada
B. Vajrayana
C. Zen
D. Mahayana

C. Zen

Explanation:

A. Theravada -  It is the dominant religion in Cambodia, Laos, Myanmar, Sri Lanka, and Thailand and is practiced by minorities in India, Bangladesh, China, Nepal, and Vietnam. The diaspora of all of these groups, as well as converts around the world, also practice Theravāda. ( NOT USA )

B. Vajrayana - Map showing the dominant Buddhist tradition throughout Asia, Vajrayana (in the form of Tibetan Buddhism) dominates the Himalayan regions and in the Mongolian regions. ( NOT USA )

D. Mahayana - In the course of its history, Mahāyāna Buddhism spread throughout South Asia, Central Asia, East Asia, and Southeast Asia. It remains influential today in China, Taiwan, Mongolia, Korea, Japan, Vietnam, Nepal, Malaysia, and Bhutan. ( NOT USA )

the correct answer is history and tradition.

the roman army grew in size and became dominant in the mediterranean region.