On May 10, 1869, at Promontory Point, Utah, workers drove a spike that linked two rail lines, one snaking from the East, the other from California, completing America's first transcontinental railroad. This event helped launch an era of economic development that would transform a Jeffersonian society of yeoman farmers into an industrial powerhouse.
the answer is B by the way, good luck!
Sweat, The answer to the question is Sweat.
The idea of "popular sovereignty" means that government is created by the people and for the people, since this dictates that the people are ultimate in charge of who is elected to the government.