The life and times of "free enterprise"

The term "free enterprise" is clearly a WWII-Cold War product, at least according to Google's Ngram (searching English-language books published in the US, no smoothing). The results show a very rapid rise during the war and a peak ca. 1945. In British English-language publications, interestingly, use of the term peaked about the same time but it enjoyed a resurgence in the 1980s that was not paralleled in the US.