Which of the following might have contributed to the decline of both the Harappan and Mayan civilizations? civil war
failure of tropical soil
European invasion
natural disasters

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.

What did the incas accomplish? a. written language b. formalized religion c. conquest of the western south america d. formalized government

Which of the following was a typical tactic of nativists in the late 1900?