The Philadelphia Eagles were initially brought into the NFL in 1933 based (legally in terms of location, not in terms of players) on the Frankford Yellowjackets franchise. The Yellowjackets had a blue and yellow uniform motif (which is why that pattern was used by the Eagles during NFL "throwback weeks" in recent seasons). The Yellow Jackets folded during the early years of the Depression, but a renewed franchise was approved into the NFL as part of the 1933-34 expansion, as the Philadelphia Eagles, with Bud Wray as owner.
The following link helped:
http://en.wikipedia.org/wiki/Frankford_Yellow_Jackets
I am also a lifelong Philadelphia Eagles fan who picked up knowledge like this reading Pro! magazine (the program guide sold at NFL games) during the 1970s and early 80s (including the Eagles' 50th anniversary season in 1983, and the NFL 50th anniversary in the 1970s).
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The Philadelphia 76ers were founded in 1946. The team colors are blue, red, and white, and they play their home games at the Wells Fargo Center.