Answer:
The main reason was to avoid conflicts between colonists and natives.
There were<span> many </span>effects<span> on the people living or coming to the United States because of the </span>transcontinental railroad<span>. Native Americans </span>were<span> affected negatively and settles and immigrants </span>were<span> affected positively. Mixed emotions led to be a problem for some time to come
Hope this helps!! (If not sorry!)</span>
Are you asking us to write a paper and site our sources????
The correct answer is D. All of the above.