After the persian war, what did sparta, athens, and other greek communities collect to ward off future external attacks?

a slaves
b corn and other grains
c money
d resources for building walls

The correct answer is C) money.

After the Persian War, Sparta, Athens, and other Greek communities collected money to ward off future external attacks.

We are talking about ancient Greek times, approximately in the 5th century BC. Persian King Darius commanded one of the most powerful armies of the time but was defeated by the Athenians in the Battle of Marathon in 490 BC. Then, it was Darius' son, who tried to capture Athens but also was defeated. To prevent other invasions, Sparta, Athens, and other Greek communities collected money to ward off future external attacks.

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.