The Territory of Oregon was an organized incorporated territory of the United States that existed from August 14, 1848, until February 14, 1859, when the southwestern portion of the territory was admitted to the Union as the State of Oregon. Originally claimed by several countries (see Oregon Country), the region was divided between the UK and the US in 1846. When established, the territory encompassed an area that included the current states of Oregon, Washington, and Idaho, as well as parts of Wyoming and Montana. The capital of the territory was first Oregon City, then Salem, followed briefly by Corvallis, then back to Salem, which became the state capital upon Oregon's admission to the Union.

The United States House of Representatives is the lower house of the United States Congress, with the Senate being the upper house. Together they compose the national bicameral legislature of the United States.

The House's composition was established by Article One of the United States Constitution. The House is composed of representatives who sit in congressional districts allocated to each state on a basis of population as measured by the U.S. Census, with each district having one representative, provided that each state is entitled to at least one. Since its inception in 1789, all representatives have been directly elected. As of 2021, the number of voting representatives is fixed by law at 435. If enacted, the DC Admission Act would permanently increase the number of representatives to 436. In addition, there are currently six non-voting members, bringing the total membership of the House of Representatives to 441 or fewer with vacancies. As of the 2010 Census, the largest delegation was that of California, with 53 representatives. Seven states have only one representative: Alaska, Delaware, Montana, North Dakota, South Dakota, Vermont, and Wyoming.The House is charged with the passage of federal legislation, known as bills; those of which that are also passed by the Senate are sent to the president for consideration. The House also has exclusive powers: it initiates all revenue bills, impeaches federal officers, and elects the president if no candidate receives a majority of votes in the Electoral College.The House meets in the south wing of the United States Capitol. The presiding officer is the Speaker of the House, who is elected by the members thereof. The Speaker and other floor leaders are chosen by the Democratic Caucus or the Republican Conference, depending on whichever party has more voting members.