What is significant about vicente fox’s election as mexico’s president in 2000?
a. it signaled the start of another revolution.
b. it meant the beginning of single-party rule.
c. it marked the end of single-party rule.
d. it ended years of conflict with the united states.

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.