alternatehistory.com

New York City was originally just Manhattan and the Bronx, but through referendums in the late 1890s, Queens, Brooklyn, and Staten Island all became boroughs.

With a PoD of no earlier than 1870, try to have New York City expand to as north as far Sleepy Hollow and the Rye Bridge and as far into Long Island as Oyster Bay, Hicksville, and Seaford by the 1920s.

I know the history of local politics is hard to find for a lot of these places (I've been trying), but try and be as detailed as you can.

Bigger bonuses the further you get out, Westchester, Yonkers, Mount Vernon, and New Rochelle are all well within reason and so not as fun.
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