June 1846

Wednesday 10:

Mexican-American War: The California Republic declares independence from Mexico.

Sunday 14:

Anglo settlers in Sonoma, California, start a rebellion against Mexico and proclaim the California Republic.

Monday 15:

The Oregon Treaty establishes the 49th parallel as the border between the United States and Canada, from the Rocky Mountains to the Strait of Juan de Fuca.

Tuesday 16:

The Papal conclave of 1846 concludes. Pope Pius IX is elected pope, beginning the longest reign in the history of the post-apostolic papacy.

Friday 19:

First baseball game under recognizable modern rules in Hoboken, New Jersey, United States.