Propaganda site. You are supposed to superficially read the graphs’ titles and notice the big arrow, then uncritically accept the narrative that something happened around 1971.

When you see a personal blog site or social media post with a graph or graphs on it, stop and think.
First, are these real and accurate graphs? What is their source? Look up the same info on reputable sites that track these numbers to verify.
Second, notice attempts to manipulate. All those big arrows pointing to 1971 as if they mean something. In most cases there isn’t even an inflection point or other notable feature of the data at 1971, but the arrow makes you think there is if you don’t look closely.

edit to add: if you start looking up graphs of things like wages vs productivity and wages compared between income groups, you’ll find that things started going to hell during the Reagan era, when Reagan and Thatcher devastated the economy by slashing income taxes on the wealthy and corporations, deregulated industry, and busted the unions, and more.