In late March, 1958, President Eisenhower publicly announced the United States’ intention to launch a spacecraft to the Moon.  He assured the nation that  this was not science fiction.  It was an achievable goal presented by leading scientists.  The announcement came less than 2 months after the first US satellite had reached orbit.  The President was committing the nation to a space race to the moon with the Soviets.  If all went well the country would have a spacecraft in orbit around the moon before the summer was over.
Vanguard 1 Satellite
Vanguard 1
Pioneer 1 on the Launch Pad
Pioneers 0-2 Satellite Replica
Pioneer 3