Describe the key features of trans-Mississippi Native Americans and th

Describe the key features of trans-Mississippi Native Americans and the impact that the movement of whites into the area had on them.

What will be an ideal response?

ANSWER
Features: 300,000 Indians in over 200 tribes; both nomadic and sedentary; diverse in cultures and social organization; Plains Indians horse culture; Pueblo Indians agriculture; Great Basin and California Indians meager existence; Northwestern Indians elaborate social system based on abundance.
Impact: lost land; conflict; reduced numbers.