[T]he theory has been applied to two contemporary societies. The first... is a structural-demographic model for the... USA... the basis for the 2010 … - Peter Turchin

In my book, Ages of Discord I talk about the Progressive Period... [the] 1920s especially. Remember... the original Red Scare was in the 1920s. So when we look at the existence of the Soviet Union, established in 1920 and collapsed in 1989, this is the period when... I grew up, by the way, in the Soviet Union, and I remember how the newspapers like were talking about the horrors of capitalism... There are multiple lines of evidence that show that the influence from the Soviet Union... By the way, also from during the 1930s. Those were, in fact, important influences on the Roosevelt administration in... designing an equitable system. ...When the Soviet Union ... collapsed, it was misinterpreted as the triumph of neoliberal economics... and here we are essentially. ...This is an important factor. So the failure by the elites. It could be both due to internal challenges... and by the way, in the 1920s there were challenges... even earlier from [the] 1890s... from the Populist movement in the United States, and the Socialist movement in the United States. ...So those were internal. There were also external influences from competitors such as the Soviet Union.

GDP per capita shows no break in the 1970s. It slowed down... around the financial crisis of 2007–2008...

In the United States, we have stagnating or declining real wages, a growing gap between rich and poor, overproduction of young graduates with advanced degrees, and exploding public debt. These... social indicators are... related... dynamically. They... experienced turning points during the 1970s. Historically, such developments have served as leading indicators of looming political instability. ...50-year instability spikes occurred around 1870, 1920 and 1970, so another could be due around 2020.