In 1947, the Catholic leaders of the San Antonio, Galveston and Dallas Dioceses voted to surrender counties within their Ecclesiastical jurisdiction to create the Diocese of Austin. This move led to the raising of St. Mary Church in Austin to a Cathedral Church and the selection of Louis J. Reicher, the Prothonotary Apostolic and Chancellor of the Diocese of Galveston, as the first Bishop of the Austin Diocese. The new diocese included parishes, missions, stations, chapels, schools, hospitals and St. Edward's University. Soon after his installation, Bishop Reicher began construction projects for the diocese. In all, he would build or remodel about 260 buildings. He also helped organize the Diocesan Council of Catholic Women, strongly endorsed the Cursillo movement, and established the Diocesan Committee on Human Rights during his 23-year tenure. Reicher's successor, Bishop Vincent Harris, focused on attracting Mexican Americans to religious vocations and worked with social justice issues, all while the diocese ordained record numbers during his 14-year tenure.Since the 1980s, major focuses of the diocese have included social ministry, missions and formation laity. The diocese has aided non-Catholics as well through its hospitals, healthcare and daycare centers, and other health facilities. Catholic schools in the diocese have also educated thousands of students. By 2008, the Diocese of Austin included 125 parishes in 25 counties. Today, it continues to provide for the spiritual needs of area Catholics, as well as to the educational, health and social needs of residents throughout Central Texas. (2008)

On January 6, 1915, nine men of Mexican descent met in San Diego, seat of Duval county, and signed El Plan de San Diego, a manifesto calling for political insurrection in response to contemporary social and political events. The proposed rebellion also had international implications, significantly impacting the Mexican revolution and American preparedness for World War I. El Plan de San Diego called for Mexican Americans, African Americans, Native Americans and Japanese Americans to rise in arms throughout the American Southwest on February 20, 1915, using force to separate Texas, New Mexico, Arizona, Colorado, and California from the U.S. and establish a new nation. Deodoro Guerra, an Hidalgo County merchant, became aware of the plan on January 24, when Basilio Ramos Jr., a signer of the document, attempted to recruit Guerra to join the uprising. Guerra sent word to Hidalgo County law enforcement officials, who arrested Ramos. Newspaper accounts of the proposed revolt appeared throughout the nation, causing panic and fear to spread. Though nothing happened on February 20, near-daily raids occurred in July in the Lower Rio Grande Valley. Many citizens and law enforcement officials resorted to extrajudicial means to terrorize and murder hundreds, and possibly thousands, of Mexicans and Mexican Americans. At the request of Governor James Ferguson, President Woodrow Wilson began sending soldiers to the U.S.-Mexico border. Tens of thousands of U.S. Army and National Guard troops deployed. Historians attribute the turmoil from El Plan de San Diego and its period in history to political upheaval and maneuvers from leaders of the Mexican revolution, efforts of Axis powers to keep the U.S. out of WWI, and longstanding ethnic and cultural conflicts between original south Texas settlers of Mexican descent and newcomers. (2015) 

By 1940, missionary priests of the Holy Cross Order were ministering to residents of Marble Falls. Beginning in 1951, Catholic residents worshipped in a local residence; by 1954, attendance had grown enough to warrant a mission. The Catholic community bought property that year and by 1957, the Texas Granite Company began construction on a granite structure. The first mass held in the new chapel occurred on Christmas Day of that year, though the structure was fully completed and dedicated in 1961. Since the church’s early years, parishioners have aided needy residents of the area. Today, the church continues to serve as a religious and community leader in Marble Falls. (2008)