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"ERAS" is modified from John Gerring's "EPOCHS"

In his 1998 book, Party Ideologies in America, 1828-1996, John Gerring divided Democratic party politics into three "Epochs": Jeffersonianism (1828-1892), Populism (1896-1948), and Univeralism (1948-1992).

I modified his classifcation into three nearly identical "Eras" with different titles and slightly different dates, and I extended the classification into the twenty-first century.

ERAS
Years
Platforms
COUNT

1 1828-1896: States' Rights

68
15
209

2 1900-1948: Cooperative Federalism

32
13
534

3 1952-2016: National Authority

64

17
2,649

Total

188
45
3,392