Canada gets one too and the two countries merge into one - provinces become states, territories become, erm, territories. free period to negotiate mergers with each other in a logical fashion - I expect a lot would end up glued together and we'd have about 35 provistates, but whatever, if the little guys want to be near-meaningless they can go for it.
only a House and a President (and a Supreme Court), no Senate. basically exists for his veto pen and statesmanship; it's up to party leadership to work together to form coalitions/agreements in the house. all elections are proportional representation by state, minimum benchmark of 10% (to keep parties at least somewhat grounded in mainstream influence, not one-note issues.) all division of power between the states is proportional - it'll be a massive House because we need at least 10 per state so places like New York will have a ton of them, but as pointed out above, this doesn't mean much in the internet era.
i'd expect that in the first election we'd get about 2% of representatives from other parties (Libertarians could get to 10% in a couple states, I'm sure,) and this would slowly rise over time, though I'd still expect to see 'majority house' about a third of the time or so.
oh, and no more midterm elections - vote for President and House once every four years, same day. House cannot collapse from loss of confidence, only be stalled, so no 'extra' big elections - individuals could face recall elections in their districts, though.
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[NO BARKLEY NO PEACE]