W.r.t. most of those graphs, the (rightfully so) collapse of Bretton Woods: https://en.m.wikipedia.org/wiki/Bretton_Woods_system

Nice graphs. 1971 coincides approximately with the start of the era of stagnation[1] in Soviet Union, when the socialist block began stalling, until its dissolution in late 80s/early 90s. I think the elites of the capitalist block stopped sharing the productivity gains with workers the moment they felt Soviet Union was stalling, as the perceived threat of squeezed people sympathizing with socialism and kickstarting some revolution vanished.

Capitalism, that has competition as one of its pillars, seemly started degrading when its sole competitor collapsed.

[1] https://en.m.wikipedia.org/wiki/Era_of_Stagnation

Historian Peter Turchin actually has an answer to that question: https://en.wikipedia.org/wiki/Peter_Turchin