Explorer 1 was the first American satellite to reach orbit on 31 January 1958.
A Juno I launches the first American satellite, Explorer 1
The Thor-Able was an American expendable launch system and sounding rocket used for a series of re-entry vehicle tests and satellite launches between 1958 and 1960.
Thor-Able on display at the Air Force Space & Missile Museum
Thor-Able 130 with Pioneer 1 (10 October 1958)
Thor-Able 134 with Explorer 6 (7 August 1959)
Thor-Able 148 with Tiros-1 (1 April 1960)