Its D all of the above
Hope this helped :)
2 and 3 are the ones that apply! I hope this helps!
Answer:
The transcontinental railroad also brought settlers to the frontier. they brought lumber, wood, people, and other necessities. the railroads also brought settlers and miners who laid claim to Native American land. thus, weakening the Native American hold on the west.
i hope this will help you
Explanation:
I believe it is building igloos
