How did Andrew Caregie contribute to the industrial development of the United States? O He supported labor unions and raised his workers' wages.
O He introduced pipelines instead of railroad cars to transport oil.
O He adopted new techniques to mass-produce steel at lower cost.
He financed the first transcontinental railroad, allowing rail travel coast to coast.

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.

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explanation:

did you check the study guide?

darwinism is survival of the fittest there for social darwinism is the survival of the wealthiest