I think it's D. Hindu- Arabic Numerals
It resulted in the national government pulling the last federal troops from the south and formally ending the reconstruction era
Suspicion and hostility, stemming from technological and cultural differences as well as mutual feelings of superiority, have permeated relations betweenNative Americanand non-Indians in North America. Intertribal antagonisms among the Indians, and nationalistic rivalries, bad faith, and expansionist desires on the part of non-Indians exacerbated these tensions. The resulting white-Indian conflicts often took a particularly brutal turn and ultimately resulted in the near-de-struction of the indigenous peoples.
