Replacing the NL East
ATLANTA FIREBIRDS
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Why Firebirds?: Famously torched during Sherman's march to the sea in the Civil War, Atlanta later adopted the phoenix as a symbol of its rebirth. Naming the team the Phoenix is off the table because Arizona is a thing, so Firebirds it is.
Colors: red #9c120b, #2e0a03, gold #db9d1a
BROOKLYN KINGS
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Why Kings?: That's right, not New York at all! This one requires a little extra setup to be extra-realistic, since you might have to move them out of Citi Field. Brooklyn gets its team back, so named because the borough of Brooklyn is coterminous with Kings County NY.
Colors: navy #212958, gold #f7ba2c
MIAMI WAVES
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Why Waves?: The sea, the sea! There's not a real deep meaning behind this one, just a chance to get out from under all that Marlins black.
Colors: teal #1ba2c7, #0e5164
PHILADELPHIA KEYSTONES
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Why Keystones?: This is a fairly common choice of team name for Philadelphia but maybe you'll like my take. Fun fact: I only literally just now realized that I put the team nickname on the road jersey instead of the city name. Still, it's hard to get the full "Philadelphia" on a coherent-looking uniform, so I'll keep it.
Colors: red #c83737, #792121
WASHINGTON GRAYS
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Why Grays?: In honor of the Negro League team of the same name (though they were more famously known as the Homestead Grays for most of their existence). This name was a finalist (alongside Nationals and Senators) when the Expos moved to town.
Colors: gray #a7a7b7, #5a5a70, #0f0f12