The modern U.S. Senate filibuster emerged unintentionally in 1806, and the first clearly recognized filibuster took place in 1841.

Core timeline

  • 1806 – Procedural accident that enables filibusters
    The original Senate rules allowed a majority to end debate with a motion to “move the previous question,” but at Vice President Aaron Burr’s urging, senators deleted this “redundant” rule in 1806, unintentionally creating a system of unlimited debate that made obstruction by extended speech possible; this practice is what is now called the filibuster.
  • 1841 – First recognized filibuster in the Senate
    Historians usually date the first clear, sustained use of this new unlimited‑debate power to March 5–11, 1841, when a minority of senators talked at length to block a bill backed by the new Whig majority and President William Henry Harrison, marking the first event widely labeled a filibuster in Senate history.

How the filibuster evolved after creation

  • 1917 – Cloture rule (Rule 22)
    After decades of frustration with obstruction, the Senate adopted Rule 22 in 1917, letting a two‑thirds vote cut off debate and end a filibuster, first used in 1919 against debate on the Treaty of Versailles.
  • 1975 – The 60‑vote era
    In 1975 the Senate lowered the cloture threshold from two‑thirds of senators present to three‑fifths of the full Senate (normally 60 votes), which is why most major legislation today effectively needs 60 votes to overcome a potential filibuster.

TL;DR:

  • The filibuster was effectively created by accident in 1806 when the Senate removed its majority‑vote mechanism to cut off debate.
  • The first notable, classic filibuster episode is usually dated to March 1841.

Information gathered from public forums or data available on the internet and portrayed here.