The “elastic clause” gives Congress implied power to act in areas not specifically expressed in the Constitution at the time it was written. Congress is exercising its power under the “elastic clause” when it:

A. Declares war on a foreign nation

B. Establishes a post office in a community

C. Authorizes the testing of nuclear weapons

D. Prohibits export taxes

The persian wars started when emperor darius i began an invasion of greece. what caused darius to decide to attack greece? a. greek pirates had raided persia's merchant ships and coastal towns. b. greek armies had attacked and taken over land that belonged to persia. c. greek city-states had supported rebellions in the persian empire. d. greek leaders had declared independence from the persian empire.