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

Hich explains why the constitution gave congress the power to create a system of federal courts? the constitution wanted congress to share power with the judicial branch. the constitution anticipated the need for courts lower than the supreme court. the constitution wanted congress to share power with the appellate courts. the constitution anticipated the need for courts equal to the supreme court.