3. Which generalization best describes where the first four civilizations developed? They all formed in river valleys
They all emerged on separate continents
They developed in the same climate zone
They all grew up along seacoasts

Ineed this now complete the paragraph about social darwinism. social darwinism to justify by suggesting that it is natural and acceptable for powerful and wealthy nations to colonize regions that are less powerful. used this theory to justify the practice of political, economic, and cultural colonialism.