Why are there things called unsolved mysteries? Shouldn’t they be unsolved in the first place to be called a mystery?

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.

Group formed to protect artisans and increase their profits

¿why was jackson opposed to the bank? a short answer*