Would you agree with this list of political eras and realignments

[Shadows]

I look at it less from partisan results & more from polity.

For example the early 1900's was the era of progressive. Teddy Roosevelt, the trust buster was an uber-pro labour candidate & Teddy Roosevelt IMO left much of the policies regarding labour which FDR borrowed in his 1s term. Same with Wilson who was pretty left & even a socialist Debs got 6% of the vote. Taft also started in the mould of Teddy but then digressed but he was still fairly liberal by today's standards & considering that time.

But then somewhere in the 20's perhaps it got to the point with huge economic concentration & political power. 1933 onwards with FDR was the re-alignment, 1935 Social Security Act, Industrial Recovery Act 1933 for collective bargaining, Wagner Act 1935, Minimum wage 1938, Massive income tax increases consistently. I think, it is fair to say that New Deal coalition started from 1933.

I personally think it lasted till 1980 but in the mid 1970's onwards, certain cracks & de-regulations begin to occur. But the re-alignment occurred in the 1980's. Even post the New Deal, tax rates continued to be 70% (top marginal rate) till Reagan came slashed it, estate tax, corporate tax, cut welfare, adopted certain social policies (which I consider divisive, you may disagree), increased military spending etc. It was new era since Reagan.

And the post 1980 era has persisted. Polarization started a long time back but has become worse. the African American & Southern Whites were massively polarized during Reagan. I am not sure if this is a new partisan era, but when it comes to the economic system we are in the post Reagan world.

I look at it as -

1932-1980 - New Deal Coalition
1980 - 2016 - Post Reagan world

When it comes to re-alignment, it happened since 1980 IMO but the seeds were already being sown like the seed for a progressive re-alignment is being sown now. But the re-alignment will happen with a transformational President.

@ Virginia - Re-alignments generally are about economic, social, racial policy oriented & not necessarily uber partisan. They don't necessarily have to happen after 10-20-30 years but certain economic & social conditions cause it along with transformative Presidents.

Many of them including FDR & even Reagan go beyond partisan lines & try to establish a direct connection with the people (although they may very extreme ideologies for many people). It doesn't necessarily happen because the other party is very bad (read Anti-Trump resistance).

But people stood for something, wanted to change the system, were united for a bigger cause (read  policies) & the re-alignment Presidents got massive stuff done to change the system, moved people in left/right direction & created a new coalition.