Signed by Cardinals Dennis Doughty of Philadelphia, Edward Mooney of Detroit, Samuel Stritch of Chicago, Francis Spellman of New York, Richard Cushing of Boston, and others, the Pastoral Letter of 1948, “A Christian in Action” teaches American Catholics the American Proposition Heresy in opposition to Catholic, Church- State Doctrine.
The context of the letter raises other doctrine taught by Pope Leo XIII but does not refer to his Church-State doctrine.
Duplicitous much? Quote Pope Leo XIIl when he agrees with y'all but fall silent when it comes to Catholic Church-State Doctrine.
That is, this is an early example of the collective failure of The American Hierarchy to teach the truth to American Catholics.
They have been heretical ever since.
Thus, in 1948 The Catholic Church in America was already mired in the quicksand of the Americanist Heresy and was sinking fast.
ABS was born into this monstrous heresy/lie and, it goes without saying that Pope Pius XII did not correct the heresy/error/lie.
The great Fr Fenton, long time editor of The American Ecclesiastical Review summarised Catholic Church-State Doctrine thusly - Catholics could never hold the belief that the existence of multiple false religions in a state was a good thing in itself or that these religions have a "genuine God-given right to exist. Such a right belonged only to the one religion founded by Jesus Christ for all men.