Who was the first united states president to travel to communist china and moscow?

a.
jimmy carter

b.
richard nixon

c.
bill clinton

d.
george h. w. bush

This photo shows an early mesoamerican structure, specifically from the zapotec culture. what was this structure most likely used for? a.creating terraces for farm fieldsb.practicing religious ceremoniesc.playing a ball game with stone hoopsd.protecting a city from invading armies