The 1970 United States Senate elections was an election for the United States Senate, taking place in the middle of Richard Nixon's first term as President. The Democrats lost a net of three seats, while the Republicans and the Conservative Party of New York picked up one net seat each, and former Democrat Harry F. Byrd Jr. was re-elected as an independent.
The 1964 United States Senate elections coincided with the election of President Lyndon B. Johnson by an overwhelming majority, to a full term. His Democratic Party picked up a net two seats from the Republicans. As of 2022, this was the last time either party has had a two-thirds majority in the Senate, which would have hypothetically allowed the Senate Democrats to override a veto, propose constitutional amendments, convict and expel certain officials, or invoke cloture without any votes from Senate Republicans. In practice, however, internal divisions effectively prevented the Democrats from doing so. The Senate election coincided with Democratic gains in the House in the same year.
The 1958 United States Senate elections were elections for the United States Senate which occurred in the middle of President Dwight D. Eisenhower's second term.
The 1948 United States Senate elections were elections which coincided with the election of Democratic President Harry S. Truman for a full term. Truman had campaigned against an "obstructionist" Congress that had blocked many of his initiatives, and in addition the U.S. economy recovered from the postwar recession of 1946–47 by election day. Thus Truman was rewarded with a Democratic gain of nine seats in the Senate, enough to give them control of the chamber. This was the last time until 2020 that Democrats flipped a chamber of Congress in a Presidential election cycle.
The 1928 United States Senate elections were elections that coincided with the presidential election of Republican Herbert Hoover. The strong economy helped the Republicans to gain seven seats from the Democrats.
In the 1912 and 1913 United States Senate elections, Democrats gained control of the Senate from the Republicans. Of the 32 seats up for election, 17 were won by Democrats, thereby gaining 4 seats from the Republicans. Two seats were unfilled by state legislators who failed to elect a new senator on time. They were the last Senate elections held before ratification of the 17th Amendment, which established direct elections for all seats in the Senate.
The 1910 and 1911 United States Senate election, although the 17th Amendment was not passed until 1913, some states elected their senators directly before its passage. Oregon pioneered direct election and experimented with different measures over several years until it succeeded in 1907. Soon after, Nebraska followed suit and laid the foundation for other states to adopt measures reflecting the people's will. By 1912, as many as 29 states elected senators either as nominees of their party's primary or in conjunction with a general election.
The 1819/1820 United States Senate election in New York was held on February 2, 1819, and January 8, 1820, by the New York State Legislature to elect a U.S. Senator to represent the State of New York in the United States Senate.
The 1804 and 1805 United States Senate elections were elections that expanded the Democratic-Republican Party's overwhelming control over the United States Senate. The Federalists went into the elections with such a small share of Senate seats that even if they had won every election, they would have still remained a minority caucus.
The 1790 and 1791 United States Senate elections were the second series of elections of senators in the United States. In these elections, terms were up for the nine senators in Class 1. As of these elections, formal organized political parties had yet to form in the United States, but two political factions were present: The coalition of senators who supported President George Washington's administration were known as the Pro-Administration Party, and the senators against him as the Anti-Administration Party.
The 1868 and 1869 United States Senate elections were elections which had the Republican Party maintain their majority in the United States Senate. However, six former Confederate states were also readmitted separately from the regular election, each electing two Republicans. This increased the Republicans' already overwhelming majority to the largest proportion of seats ever controlled by the party.
The 1902 and 1903 United States Senate elections were elections in which the Democratic Party gained four seats in the United States Senate, but the Republicans kept their strong majority.
The 1892 and 1893 United States Senate elections were elections which, corresponding with former Democratic President Grover Cleveland's return to power, had the Republican Party lose nine seats in the United States Senate and lose its majority to the Democratic Party. The Democratic majority, however, was minimal and didn't last past the next Congress.
The 1818 and 1819 United States Senate elections were elections for the United States Senate that had the Democratic-Republican Party gain two seats. The Federalists had only three seats being contested, of which they lost two and the third was left vacant due to a failure to elect.
The 1820 and 1821 United States Senate elections were elections for the United States Senate that, corresponding with James Monroe's landslide re-election, had the Democratic-Republican Party gain one-to-five seats, assuming almost complete control of the Senate.
The 1796 and 1797 United States Senate elections were elections for the United States Senate which, coinciding with John Adams's election as President, had the ruling Federalist Party gain one seat.
The 1836 and 1837 United States Senate elections were elections that had the Jacksonian coalition emerge as the Democratic Party, and the Adams, or Anti-Jackson, coalition emerge as the Whig Party.
The 1794 and 1795 United States Senate elections were elections that had the formation of organized political parties in the United States, with the Federalist Party emerging from the Pro Administration coalition, and the Democratic-Republican Party emerging from the Anti-Administration coalition.
The 1822 and 1823 United States Senate elections were elections for the United States Senate that had the Democratic-Republican Party continue almost complete control of the Senate.
The 1824 and 1825 United States Senate elections were elections for the United States Senate that saw the Jacksonians gain a majority over the Anti-Jacksonian National Republican Party.
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