What was one of the positive effects of westward expansion?

Mining

Explanation:

Mining gold and silver greatly improved the lives on early travelers who discovered an abundance of gold and silver in the west. Additional reasons: more land and more freedom.

demand is the need and oportunity to buy a given good or service.

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.