The history of the United States Congress refers to the chronological record of the United States Congress including legislative sessions.
The Constitution defines the Senate as having two senators for each state in the Union. The size of the House of Representatives is based on the number of states and their populations. The numerical size of the House is set by law, not by the Constitution. The House grew in size as states were admitted throughout the 19th century, and as the nation grew in population. Since the Constitution allows for one representative for as few as 30,000 citizens, Congress passed new, higher limits for the House, which grew in size until a law passed in 1911, based on the National Census of 1910, established the present upper limit of 435 members of the House. Since the House's size was fixed but the population kept growing, instead of a congressperson representing only 30,000 citizens (as the Constitution had previously established), a congressperson represents 600,000 and more persons.
In different periods of American history, the role of Congress shifted along with changing relations with the other branches of government, and was sometimes marked by intense partisanship and other times by cooperation across the aisle. Its relations with the other branches of government have changed over time. Generally Congress was more powerful in the 19th century than in the 20th century, when the presidency (particularly during wartime) became a more dominant branch.
One analyst examining Congressional history suggested there were four main eras, with considerable overlap, and these included the formative era (1780s–1820s), the partisan era (1830s–20th century), the committee era (1910s–1960s), and the contemporary era (1970s–today).
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“The United States themselves are essentially the greatest poem.”
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—Henry David Thoreau (1817–1862)
“Our decision about energy will test the character of the American people and the ability of the President and the Congress to govern this nation. This difficult effort will be the “moral equivalent of war,” except that we will be uniting our efforts to build and not to destroy.”
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“The heroes of the world community are not those who withdraw when difficulties ensue, not those who can envision neither the prospect of success nor the consequence of failure—but those who stand the heat of battle, the fight for world peace through the United Nations.”
—Hubert H. Humphrey (1911–1978)
“The corporate grip on opinion in the United States is one of the wonders of the Western World. No First World country has ever managed to eliminate so entirely from its media all objectivity—much less dissent.”
—Gore Vidal (b. 1925)