Which of the following factors was the biggest reason why american indian tribes had to compete for resources during westward expansion? a. settlers began to use their lands for grazing and hunting. b. tribes had few opportunities to trade with settlers. c. settlers traveled through their lands to reach the west. d. tribes could not make money by collecting tolls from travelers.

C is the correct option.

Explanation:

Various native Indian tribes have been living in the Americas for thousands of years. Competition for resources often caused conflict among them. When Europeans started to colonize the Americas and laid claims on American lands and resources, they were bound to conflict with Natives. After the Homestead Act was passed in the US, the settlers started to move westward in Large numbers. During the 1870s United States Army was at war with Native Tribes. California Goldrush also led to the loss of native lands and a decrease in the land and resources for the natives. This brought them in conflict with whites.

During westward expansion, they settled in Dakota, Utah and Wyoming Settlers and Cattle ranchers pushed them out of their homelands. The tribes of plains did not want the Whites to cross their hunting lands and tried to destroy the wagons bound for California and Oregon.

the answer is a) the proclamation of 1763.

the term is einsatzgruppen