United States Congress

Historical eventSeptember 181850

United States Congress

The United States Congress passed the Fugitive Slave Act, decreeing that all escaped slaves be brought back to their masters.

In context

When
Wednesday, September 18 1850176 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
19th century · 1850s
Recorded from
Wikipedia “On this day” feed

Russia, Greece and some other countries used the Julian calendar into the early 20th century, so local records may show a date up to 13 days earlier.

At a glance

Dates: From 1850.

What came beforeAI-assisted

The U.S. Constitution, ratified in 1788, established Congress as a bicameral legislature with the House and Senate. The first Congress convened in 1789 in New York City.

By 1850, Congress had grown to 233 House members and 30 senators representing the expanding nation. Sectional tensions over slavery's expansion into western territories dominated legislative debates.

Catalyst / how it startedAI-assisted

The Compromise of 1850 emerged from the crisis triggered by California's admission as a free state, threatening the Senate's balance between free and slave states. Congress debated multiple bills addressing slavery, territorial organization, and fugitive slave enforcement throughout the spring and summer.

Who was involvedAI-assisted

Key figures included Senator Henry Clay, who crafted the compromise package, and Senator Stephen Douglas, who shepherded individual bills through Congress. President Zachary Taylor initially opposed the compromise but died in July; his successor Millard Fillmore supported it.

TimelineAI-assisted

September 18, 1850: Congress passed the final component of the Compromise of 1850, the Fugitive Slave Act, completing the legislative package. President Fillmore signed all compromise measures into law by September 20.

What happened

The United States Congress is the legislative branch of the federal government of the United States. It is a bicameral legislature, including a lower body, the U.S. House of Representatives, and an upper body, the U.S. Senate. They both meet in the United States Capitol in Washington, D.C.

September 18 through the years

Other entries on the same calendar day, in order.

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Also in 1850

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  • October 23National Women's Rights ConventionThe inaugural National Women's Rights Convention, presided over by American activist Paulina Wright Davis (pictured), began in Worcester,…
  • December 16Canterbury AssociationSettlers of the Canterbury Association aboard Randolph and Charlotte Jane arrived to establish a colony at Christchurch, New Zealand.
  • June 13American League of Colored LaborersThe American League of Colored Laborers, one of the first labor unions for African Americans, was established in New York City.
  • March 7Daniel WebsterUnited States senator Daniel Webster (pictured) delivered a speech advocating compromise on slavery, which proved to be unpopular with ab…

Everything we record for 1850 →

Sources

Cite this page

“United States Congress”, What's On This Date, https://whatsonthisdate.com/app/event/united-states-congress-1850-september-18, accessed October 27, 2026.

Cite the underlying source as well — the source links above go to the record this entry is adapted from.

Questions about this entry

When did United States Congress happen?

September 18 1850 — 176 years ago, on a Wednesday.

Where does this text come from?

Wikipedia “On this day” feed. Summaries are short adaptations that link back to the source, not reprints. Panels marked AI-assisted were filled where the sources left a heading empty.

How do I cite this page?

Use the ready-made citation near the sources at the bottom of the page, and follow the source link to cite the underlying record as well.

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