Was america use of atomic bomb on japan to end ww2? justified

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.

Why did france demand that germany repay their debts in foreign currency?

Before world war 1 started, austria-hungry was wary of (spain or serbia) because of border disputes