Explain the increase in violent conflicts in the western united states in the late 1800s?

This was caused by the increase in migration by white settlers.

Explanation:

From the late 1800's lots immigrants were entering the United States from Eastern and southern Europe. Millions of immigrants and poor farmers arrived in cities of New York, Boston, Philadelphia, St. Louis and Chicago,

immigrants live separately in a different neighborhood and a number of them kept their own customs and tradition.