What was the nickname given to the time. In American history that started in 1965 and ended in 1900?

the gilded age

the roaring 20s

the golden age

the middle ages

Your answer is: The Gilded Age, assuming you meant 1865 through 1900.

The "Roaring 20s" have nothing to do with anything before 1900, and refer to the decade of 1920, so we can rule this one out. The "Middle Ages" refer to the 5th to 15th century, ruling out this option, as well.

The "Golden Age" and the "Gilded Age" sound similar, refers to around 500 to 300 BC in Greece, also ruling this option out. We're only left with one option now, this being the "Gilded Age."

Are you sure 1965 is right? Could it be 1865? I think you are looking for the Gilded Age from late 1860s to 1900.