How did the arrival of European settlers change life for indigenous people on the plains?

A. Settlers killed nearly all the buffalo and most indigenous people were moved to reservations.

B. The settlers and Native Americans used horses to hunt buffalo more effectively and carefully managing the resources.

C. The arrival of settlers had no impact on the lives of indigenous people in the Plains region.

D. Settlers and the indigenous people of the Plains shared ideas and ways of doing things, continuing to always occupy the same land.

The answer is  A. Settlers killed nearly all the buffalo and most indigenous people were moved to reservations.

Sadly that is what happened to most of the native americans that hunted buffalo.  :(

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals