Something something "The Triumph of Liberalism", and I'd guess that if this were to begin at some point, it'd be the 70's, with the early 1990's being its "peak".
To expand on that, I was referring to the "rise of the right" in countries like the United States and the United Kingdom, as well as the death of Mao in China. I only thought like a second ago of another example: Samuel Huntington's "The Third Wave" marked, well, the "Third Wave"'s [defined here as the third wave of democratization] beginning at about like 1974, itself completing in 1990-ish--or at least that's when he wrote the book.