Why did tension between the Cheyenne and Arapaho and the miners in Colorado begin to raise in the 1860?

Tensions between the Cheyenne and Arapaho tribes and miners in Colorado escalated in the 1860s primarily due to the influx of settlers and miners seeking gold and resources in the region, which encroached upon Native American lands. The discovery of gold in 1858 led to an increasing population of miners, prompting conflicts over territory and resources. Additionally, broken treaties and the U.S. government's failure to protect Native American rights further fueled resentment and hostility, culminating in violent confrontations such as the Sand Creek Massacre in 1864.