In 1895, Pope Leo XIII wrote an encyclical addressed to the Bishops of the United States, Longinqua (On Catholicism in the United States) and in 1899 addressed Cardinal James Gibbons Archbishop of Baltimore in a letter entitled Testem Benevolentiae Nostrae (Concerning New Opinions, Virtue, Nature and Grace, With Regard to Americanism)
Both writings review the state of affairs of the Catholic Church in late 19th century America, and the latter addressed certain errors that were developing in the Catholic Church in the United States at that time.
On June 27, 2019, members of the Traditional Knights Latin Mass Network, approved a resolution endorsing and affirming support for both Longinqua and Testem Benevolentiae Nostrae.
A RESOLUTION ON CATHOLICISM IN THE UNITED STATES AND ON AMERICANISM (PDF link), as approved on June 2019
It also resolved the following:
- To affirm and endorse the teachings and exhortations contained in Longinqua and Testem Benevolentiae Nostrae
- To endorse and practice these teachings contained in the above writings and encourage all Knights to implement these in all activities
- To promote not only the corporal works of mercy, but the spiritual works of mercy in the parishes through specific activities and devotions
Papal Encyclical: Longinqua – On Catholicism in the United States, by Pope Leo XIII, January 6, 1895
Letter to the U.S. Bishops: Testem Benevolentiae Nostrae - Concerning New Opinions, Virtue, Nature and Grace, With Regard to Americanism, by Pope Leo XIII, January 22, 1899 (The Heresey of Americanism)
Americanism: Then and Now, by Russell Shaw, Former Director of Public Information of the Knights of Columbus, Catholic World Report, May 1995 (Provides detailed background surrounding the hersey of Americanism as outlined in Testeum Benevolentiae Nostrae)