First, Sharing of GDP:
Then, Division of wealth from 1980 (Reaganomics Era begins 1981):
Source:
In 1965 the wealth was mostly in the hands of people who made more money (as expected), but division grew because the lower-income groups did not get the same increases as the top 10% (90th percentile). This chart ends in 2016, but the steady incline shows the rich get richer and the others do NOT.
Source: https://apps.urban.org/features/wealth-inequality-charts/
We can change the economy and how the wealth is distributed. The huge gap between the top 10% (it's even worse between the top 1% and the next 9%) and the rest of the population (90% of the people) can be closed again to some more workable level.