Teams claimed so far and feel free to copy/paste to add to this as you claim one and draft your roster to enter the league (once it's filled, it's filled, so I won't be able to save spots that could delay it from getting started):

1) lb_bunk80: Brooklyn Dodgers 1946-55
2) expo4ever: Montreal Expos 1989-98
3) d_rock97: Philadelphia Phillies 1976-85
4) Slubby23: Arizona Diamondbacks 2016-25
5) DougDoty: Houston Astros 1979-88
6) vaugheyj: Tampa Bay Rays 2009-18
7) markthelow: Pittsburgh Pirates 1904-13
8) DCarden34: Chicago White Sox 1998-2007
9) Dufferman: Baltimore Orioles 1964-73
10) ML_dad: Minnesota Twins 2001-10
11) trd3: St Louis Cardinals 1983-92
12) lb_bunk80 (2nd team): Pittsburgh Pirates 1984-93
13) WillsRoyals: Pittsburgh Pirates 1962-71
14) WillsRoyals (2nd team): St Louis Cardinals 1939-48
15) 50milpromos: Oakland A's 1968-77