The city of Washington has the same boundaries as the District of Columbia (D.C.), a

federal territory established in 1790 as the site of the new nation’s permanent capital.

【翻译】华盛顿市与哥伦比亚特区有着相同的边界，它（指：华盛顿）是1790建立的联邦直辖区，作为这个新国家永久性首都的所在地。