GP hinted at that if you read the rest of their comment, but it took a serious nose-dive during the Truman Doctrine and Marshall Plan, and kinda petered out with Franco.
If you are really interested in data, you might check out the Freedom House website. They have been rating countries around the world on things like free elections and civil rights since 1973, and their take is that things have been going downhill since about 2006, with countries becoming more autocratic.