What was the significance of the construction of the hoover dam and mount rushmore? how did these projects affect the u. s. economy?

Both the Hoover Dam and Mount Rushmore had a profounding effect on the US Economy. It created jobs during the Great Depression which then boosted the economy by creating more jobs for people. If people earn money they will again be willing to spend it. During the Great Depression, FDR's New Deal boosted jobs and the economy not only by building The Hoover Dam and Mt Rushmore but also the more basic needs such as public roads, schools, government buldings etc. 

BRAINLIEST?

There’s no picture, but i’ll give you a few of expeditions. lewis and clark began in 1804, louisiana purchase 1802, james town 1607