I'm not going to categorically disagree with this, it's a perfectly valid criticism.
The thing is... for the foreseeable future Chicago is likely to be more united than divided politically, because of the pressing need to expand, rebuild, and defeat Victoria and foreign influence. We're unlikely to attain a state where we have the level of complacency it takes for a US-style government to become truly deadlocked, in my opinion.
Alternatively, we could include a few constitutional amendments that, say, explicitly eliminate the presidential veto as anti-democratic, require either chamber of the legislature to give bills passed by the other chamber a straight up-or-down vote, and otherwise simply remove some of the features that were most prone to create deadlock in the old United States.
Remember, at least three constitutional amendments radically altered key parts of the basic governmental machinery of the United States: the Twelfth, Seventeenth, and Twenty-Fifth.