Which civilization built machu picchu?
a. inca
b. maya
c. olmec
d. aztec

Why did the second indochina war start in 1956

Enlightenment thinkers most contributed to the development of whichpolitical idea? a. religious leaders should play the largest role in establishing asociety's laws.b. democratic governments have the responsibility to protect humanrights.c. criminals must be punished harshly if a society is to maintainorder.d. written constitutions place unnecessary restrictions ongovernments' powers.

What was the “u-2 incident” and how did it affect u.s./soviet relations in 1960?