How do you think the environment was affected by emigrants moving west on the Oregon Trail?

A lot of new cities were built. Factories in Montana and wisconsin caused mass oil leaks and low fish population. Deer and mountain lions were killed to few families. Native Americans Massacred just for a spring do drink out of.

Ifound this on google “the existence of agglomeration economies is central to the explanation of how cities increase in size and population, which places the phenomenon on a larger scale. the concentration of economic activity in cities is one reason for their development and growth.” i hope this you for what your looking for.