After Britain won the Seven Years' War and gained land in North America, it issued the Royal Proclamation of 1763, which prohibited American colonists from settling west of Appalachia.
Jet Airliner  is a song composed by Paul Pena and popularized by the Steve Miller Band. Pena wrote and recorded the song in 1973 for his New Train album. However, due to conflicts between him and his label, New Train was not released until 2000.
It was the manager of the group, Milt Okun, who took Denver's song,  Leaving On A Jet Plane , to Peter, Paul and Mary. The song became a #1 hit for the group in 1970 - their only #1 song and the biggest hit of their career. The success of the song gave Denver some exposure and allowed him to pursue his solo career, which began with the release of the album Rhymes and Reasons in 1969.