PLS HELP What are two obligations of US citizens?
to attend school in the United States
to buy a home in the United States
to pay state, local, and federal taxes
to serve on a jury if called to do so

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.