The United States acquires the Louisiana territory from France.
Land below the Arkansas River remains Spanish territory.
Mexican Revolution. Territory of southern Colorado claimed by Mexico.
Mexico and United States battle for territory. Mexico cedes land to the U.S.
Permanent settlers from northern New Mexico establish the town of San Luis.
First Catholic Church in Colorado, Our Lady of Guadalupe, established at Conejos.
St. Ignatius established in Pueblo
Colorado attains statehood.
Diocese of Denver established.
Fr. Joseph P. Machebeuf named first Bishop.
Diocese of Pueblo established.