Why did congress want to revise the articles of confederation?

Why was hawaii so important to the united states & why did japan bomb pearl harbor?

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.

This map shows north korea and south korea today. how does this map reflect the impact of the korean war?