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I seem to remember a 5 38 podcast,
possibly an add-on their Gerrymandering series,
proposing a more equable Senate.
It reveolved around California choosing to break into 3 or 4 states,
all of which would be Democrat majority,
that would remain some of the more populous in the US.
The counter argument, was that Republicans would do the same with Texas,
but mainly to ensure that some Senate seats remained for the GOP,
to counter the Blue spreading from cities like Austin and San Antonio.I just found this article that may give some background.
I was idly wondering about a seceded Republic of Texas.