Question

what was the primary energy source that powered the factories of the gilded age? (1 point)
electrical power from a national grid.
gasoline engines for running machinery.
solar power collected by large panels.
steam power generated by burning coal

Explanation:

The Gilded Age (late 19th century in the US) was before widespread national electrical grids (which became more prominent later). Solar power as described was not a major factor then. Gasoline engines for factory machinery were not as common as steam power during that era. Steam power generated by burning coal was the primary energy source for factories during the Gilded Age, as steam - powered machinery was well - established in industrial settings by then.

Answer:

Steam power generated by burning coal.