In 1973, "The World On The Move" began to change. General Electric decided to close Carousel of Progress, which later reopened at a new home in Walt Disney World in 1975 as part of its expansion. In 1974, with the American Bicentennial approaching, Disney designers seized the opportunity of the vacant carousel theater to present a large musical extravaganza called America Sings, which featured 114 Audio Animatronics. The following year, Flight to the Moon was updated into Mission to Mars, as actual flights to the moon had become a reality since the former's construction.