Category:Events in Washington, D.C. in the 20th century
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States of the United States: Arizona · California · Colorado · Connecticut · Hawaii · Illinois · Indiana · Maine · Maryland · Massachusetts · Michigan · Mississippi · Missouri · New Jersey · New York · North Carolina · Ohio · Oklahoma · Oregon · Pennsylvania · South Carolina · Washington · West Virginia · Wisconsin – Washington, D.C.
Most populous urban areas of the world: Barcelona [ES] · Beijing [CN] · Boston [US] · Chicago [US] · Hong Kong [CN] · London [GB] · Los Angeles [US] · Madrid [ES] · Milan [IT] · New York City [US] · Philadelphia [US] · San Francisco [US] · Shanghai [CN] · Singapore [SG] · Washington, D.C. [US]
Subcategories
This category has the following 11 subcategories, out of 11 total.