Which civilization below vanished, for seemingly no reason, around 900 AD? Aztec

Olmec

Maya

Inca

To what extent did mary lease's concepts of justice, freedom, and equality agree with those of samuel gompers and emilio aguinaldo? how did they compare with those of the pinkertons at homestead?

How did the russian revolution impact world war i? a) the russians required the allied powers to come to their aid and defeat the radical groups. b) the russians pulled out from the war, enabling the germans to focus on the western front. c) the russians created new technological advancements that were used by the allied powers to win. d) the russians created a new communist government that aligned with the central powers instead.

Did the west show signs of cultural decline in the 20th century?