They are a member of the East Division of the American League . After 52 often-beleaguered years in St. Louis, the franchise was purchased in November 1953 by Baltimore business interests led by Clarence Miles. The Orioles experienced their greatest success from 1964 to 1983, as well as the mid-1990s, and have won a total of nine division championships , six pennants , three World Series championships , two wild card berths , and five Most Valuable Player Awards .
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