- The Con column is short for Congress. When the country was founded, the first Congress was 1. Every two years, the Congress number increments.
- In the Year column, a blue background means the Democratic Party had a filibuster-proof majority in the Senate that year. A pink background means that there was a filibuster-proof majority during a portion of that year. No other party has had filibuster-proof majorities.
- Except for the Year column, all text in the table are links to additional detail. When you move your mouse pointer over this text, you'll see the telltale underline, indicating a link.
- Starting in 1933, presidential inaugurations are held on January 20 at noon. Prior to that, inaugurations were held on March 4. For simplicity, the Year column in the table doesn't consider these days. For example, Barak Obama's presidency is shown as 2009-2016 even though it also includes twenty days in 2017.
- The symbol † means died in office while holding the position indicated in the table.
- Beginning with the 74th Congress, the new Congress begins on January 3 at noon of the odd-numbered year. Prior to this, the new Congress started on March 4th. For simplicity, the Year column in the table doesn't consider these days. For example, the 115th Congress is shown as 2017-2018 even though it also includes three days in 2019.
- For the 107th Congress, the Republicans had the majority in the Senate up until June 6, 2001. The Democrats had the majority for the remainder of the term.
- This table is not the output of a spreadsheet program. It's lovingly hand-crafted HTML5/CSS3.
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