@K-C Quite possibly, although I'd wait to see if there's more splits like the one on the AHCA before making that call.

The US system has always encouraged polarizing into two parties, with a number of sub-parties within them.

Sometimes those become new parties altogether (although that hasn't happened since the collapse of the Whigs). But usually they maintain enough grouping with their parent party that they just influence where that party goes.

I don't know if you'd really call that equivalent to a parliamentary minority government or not. My understanding of that setup is that the minority party is central enough that it works with various other groups to pass things which that other party is willing to support (either because they outright support it, or in trade for support on their agenda elsewhere).

If moderate/mainstream Republicans start passing things by including Democrat support and ignoring the Freedom Caucus, I'd definitely say they were equivalent.