That same year, Shanley wrote the Fargo Argus defending Native Americans living on the Turtle Mountain Indian Reservation.

He denounced actions taken by local Indian agents that hurt the Chippewa/Ojibwe people and highlighted positive aspects of their culture.

[6]Pope Pius X named Reverend James O'Reilly of Saint Paul as the second bishop of Fargo in December 1909.

[10] After World War II, Muench spent much of his time on Vatican assignments in West Germany while still serving as bishop of Fargo.

While Muench was in Europe, Pope Pius XII appointed Bishop Leo Dworschak of the Diocese of Rapid City to serve as apostolic administrator in Fargo.

[11] After Dworschak retired in 1970, Pope Paul VI appointed Reverend Justin Driscoll, president of Loras College in Dubuque, Iowa, as the next bishop of Fargo.

[13] He improved the financial condition of the diocese and funded the Priest Pension Plan through the Shepherd's Care Campaign.

[13] In 2001, John Paul II named Monsignor Samuel J. Aquila of Denver as coadjutor bishop of the diocese to assist Sullivan.

The diocese in 1998 removed Reverend Fernando Sayasaya from ministry at Blessed Sacrament Parish in Fargo after three teenage boys accused him of sexual abuse.

[17] In a 2010 article, the Grand Forks Herald discussed a sexual abuse case it had originally reported in March 1994.

[18] In January 2020, the diocese published a list of 31 diocesan clergy with credible accusations of sexual abuse of children, dating back to 1950.

While assigned as a priest at the Church of the Resurrection Parish in Lansing, Michigan, in the 1960s, Sullivan allegedly touched two young boys inappropriately and used sexual language with them.

[22] In December 2022, a woman reported to the diocese that she had been sexually victimized by Reverend Neil Pfeifer, pastor of three churches in the Jamestown area, between January and March 2021 during counseling sessions.

[25] Presentation Sisters (former) The Diocese of Fargo operated Cardinal Muench Seminary, established in 1962, for the formation of men to the priesthood.