Well, one cause they had is coal. they used that for railroads and factories. but coal caused a lot of damage to the environment at that time. hopefully this is correct. good luck.
Answer: Answer B
Explanation: Congress regulated the meat packing industry after sending investigators to see if Sinclair's book was telling the truth.
I would say alliances and nationalism because nationalism only encouraged countries to go to war and prove that they were the best most powerful country around and in terms of WWI, nationalism led to strong dedication to the army and just keep most countries in the war longer than they should have been in it. Alliances were significant in the exact beginning of the war and the scale to which the war was fought. The many (secret) alliances led to austria-hungary and Serbia to sorta threaten each other, which brought Germany in, then France, etc.
becuase people don't like change and for all Americans know they could be spys from the counrty that they said they were trying to get out of.
