01-01-1845 – The last Mexican governor of Alta California, Pio de Jesús Pico, grants his brother Andrés a very favorable nine-year lease on San Fernando Rey.
12-29-1845 – The Republic of Texas becomes part of the United States.
1845-1846 – A former missionary of British Guiana, Fr. Eugene MacNamara, promotes a scheme under which 3,000 Irishmen and their families would immigrate to Alta California. Events overtake the implausible scheme when the United States begins to intervene in California.