Former President Herbert Hoover was not invited to the dedication of the massive Hoover dam.

Herbert Hoover (born 1874 - died 1964) was the 31st President (1929-1933) of the US. The massive dam on the Colorado River (on the border between the states of Nevada and Arizona) that now bears Hoover’s name was approved when he was secretary of commerce and was under construction while he was president. He was defeated for reelection by Franklin Roosevelt. While the engineering marvel was originally proposed to be called Hoover Dam, Roosevelt’s Secretary of the Interior Harold Ickes claimed “Hoover had very little to do with the dam” and changed its official name to Boulder Dam. When Roosevelt dedicated the dam on September 30, 1935, the administration did not invite Hoover to the ceremony and the president did not even mention his predecessor in his speech. In 1947, President Harry Truman signed a law that restored the original name—Hoover Dam.