Timeline

1803
The United States acquires the Louisiana territory from France.
Land below the Arkansas River remains Spanish territory.

1821
Mexican Revolution.  Territory of southern Colorado claimed by Mexico.

1848
Mexico and United States battle for territory.  Mexico cedes land to the U.S. 

1851
Permanent settlers from northern New Mexico establish the town of San Luis.

1858
First Catholic Church in Colorado, Our Lady of Guadalupe, established at Conejos.

1873
St. Ignatius established in Pueblo

1876
Colorado attains statehood.

1887
Diocese of Denver established.  
Fr. Joseph P. Machebeuf named first Bishop.

1941
Diocese of Pueblo established.