AHC: Make fights in US Congress as usual as in Russian Duma.

Multiple parties with a great disparity of beliefs and more violent rhetoric would probably do it.

Progressives stick around, Socialists stick around, the racists all join up as the American Independent Party in the sixties, and some far-leftists, libertarians, and greens get into Congress?
 
Progressives stick around, Socialists stick around, the racists all join up as the American Independent Party in the sixties, and some far-leftists, libertarians, and greens get into Congress?

Definitely a multi-party system with a Socialist left and a far right party that supports segregation would lead to some pretty interesting brawls on the floor of Congress especially during the Red Scare in the 20s. Assuming that isn't butterflied away.
 
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