What are the three levels that geographer's study?

What from the columbian exchange had perhaps the biggest impact on the world?

What was unification difficult to accomplish in both germany and italy? a.) weaker states we’re attacked by stronger states for control of the emerging nations. b.) major european powers fought to keep independent states under their control. c.) germans and italians did not share common histories and languages.

Which country was the last to join the allied powers? o great britain o france o united states o china