Which document was written to guide the new country through the war

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.

How did europeans and africans displace native americans in north america’s predominant peoples?

What was one major cause of worldwide conflict during the first decade of the 21st century?