What are the obstacles to sustainable development in this subregion?

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.

Which of the following phrases best describes american society in the early 1900s

What happened 10 million years ago? if u answer, u get 50 ! plz answer ; -;