If you can awnser all theses I’ll mark you brainlist plz it mean a lot!

Why did america oppose the axis powers

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.

Principles of cultural identity have been used to justify conflict. true false