Compare the emergence of advanced civilizations in Meso and South America with the four early river valley civilizations. In contrast to the Harappan civilization, which of the following might have contributed to the decline of the Mayan civilization? (1 point)

a
flood

b
drought

c
invasion from the Aryans

d
lack of trade options

Drought

Explanation:

All three of these factors–overpopulation and overuse of the land, endemic warfare and drought–may have played a part in the downfall of the Maya in the southern lowlands.

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.