Guess the 1970s song lyrics #259

1970. This song is by a Canadian group. The song was improvised on stage in Canada. A kid had a tape recorder and they asked him for the recording. Once at the US border, they were thought to be draft dodgers. They were happy to be in the safety of Canada. When they played at the White House, they were asked not to play this song because it was perceived to be an anti war song.