The completion of the first transcontinental railroad helped aid settlement in which area?

What are the reasons that some europeans moved and began colonizing the new world? select all that apply: options: better economic opportunities. some were escaping religious persecution. attempting to increase their wealth, despite the hardships and risks. the new world was safer and more secure than the old world.

What happened between 1804 and 1815

What are two major challenges resulting from the increasing global population