WHAT ALL HAPPENED MARCH TO MAY 1846
Find out what all happened March to May 1846

Mexican–American War: The United States declares war on Mexico. (13. May 1846)

Thornton Affair: Open conflict begins over the disputed border of Texas, triggering the Mexican–American War. (25. April 1846)

Mexican–American War: Siege of Fort Texas. (27. March 1846)

The Donner Party of pioneers departs Springfield, Illinois, for California, on what will become a year-long journey of hardship, cannibalism, and survival. (14. April 1846)

Mexican–American War: General Zachary Taylor captures Monterrey. (24. May 1846)

The few remaining Mormons left in Nauvoo, Illinois, formally dedicate the Nauvoo Temple. (1. May 1846)

The Cambridge Chronicle, America's oldest surviving weekly newspaper, is published for the first time in Cambridge, Massachusetts (7. May 1846)

Mexican–American War: President Mariano Paredes of Mexico unofficially declares war on the United States. (23. May 1846)

Mexican–American War: The Battle of Palo Alto – Zachary Taylor defeats a Mexican force north of the Rio Grande in the first major battle of the war. (8. May 1846)

President James K. Polk asked for and received a Declaration of War against Mexico, starting the Mexican–American War (11. May 1846)