What geographic conditions posed the greatest challenge for early civilizations? (this is about stuff like mesoamerica, olmec, aztec, and inca, stuff like that)

Create a top 5 list of events related to westward expansion that affected african americans the most list of event: missouri compromise compromise of 1850 kansas nebraska act dred scott v sand ford fugitive slave act nat turners rebbelion bleeding kansas harpers ferry explain why you made your 1 on the list number order from most impact to least impact

Why was russia drawn into a conflict with germany after ausria-hungary declared war on serbia ?

Explain how social darwinism impact imperialism.