Answer:
B) advancements in farming
Explanation:
the only tribes that did not have permanent settlements were the ones who chased their food. like the blackfoot tribe. because of this since food sources like buffalo were always on the move, they couldn't stay in one place. however with the advancements made in farming, they were able to stay in one place usually close to a river and grow their food while only hunting nearby wild life.
It was the completion of the Northern Pacific Railroad that mostly changed the feelings toward Chinese workers in Washington because the rail lines were so popular.
