How did the transcontinental railroad affect communication?

It was Abraham Lincoln who signed the bill authorizing the transcontinental railroad, in no small part from a need to create greater communication and union with the new states of California (1850), Oregon (1859) and Nevada (soon to come in 1864).

mass production/ assembly line production

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.