What city is known as the byzantine empires economic and religious center

What is the ancient chinese belief that god chooses the emperor?

What are some inventions during the han dynasty?

How did the united states respond when north vietnam attacked a us warship and sent troops to south vietnam in the early 1960s? a.the united states declined to assist south vietnam against the north. b.us leaders authorized south vietnam to invade north vietnam. c.the president did not sign the gulf of tonkin resolution. d.congress authorized the president to escalate the conflict.