How many times has the senate used the fillabuster?

The filibuster has been used in the U.S. Senate countless times since its formal establishment in the early 20th century. Although exact numbers can vary due to differing definitions and contexts, estimates suggest it has been invoked over 1,600 times throughout history. The frequency of its use has fluctuated, particularly in the past few decades, as it has become a contentious tool for both parties. In recent years, efforts to reform or eliminate the filibuster have intensified, reflecting ongoing debates about its impact on legislative efficiency.