Whats the name of a non euclidean geometry?

In the mid-1800s, native americans who had lived in the westtraded their manufactured goods with settlers.were able to resist diseases carried by settlers.offered their services as guides to settlers.prevented settlers from moving onto their territory.

Aside from low birthrates and high death rates, what can cause a country’s population to decline

This map shows north korea and south korea today. how does this map reflect the impact of the korean war?