page_title: 1848 in the United States
section_title: January–March
hierarchical_section_title: 1848 in the United States / Events / January–March
context_page_description: Events from the year 1848 in the United States.
context_section_description: January 24 – California Gold Rush: James W. Marshall finds gold at Sutter's Mill, in Coloma, California.
  January 31 – The Washington Monument is established.
  February 2 – Mexican–American War: The Treaty of Guadalupe Hidalgo is signed, ending the war and ceding to the US virtually all of what becomes the southwestern United States.
  March 18 – The Boston Public Library is founded by an act of the Great and General Court of Massachusetts.
caption: May 29: Wisconsin admitted as the 30th U.S. state.