Not sure what you are asking as there really is no "American" Catholic doctrine, that would just be Catholic doctrine, as taught in America, which you can read for yourself at the first link below, which has the English translation of the Catechism.
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However, there is a heresy in the United States, which has been around for a long time, it was condemned by Leo XIII (second and third links below, the third link is the English edition of Testem Benevolentiae Nostrae): On January 22, 1899, Pope Leo XIII addressed an encyclical (Testem benevolentiae nostrae) to James Cardinal Gibbons, archbishop of Baltimore, intended "to suppress certain contentions" that had arisen in America "to the detriment of the peace of many souls." In essence, Leo feared that some American Catholic intellectuals, including a number of bishops, were finding canonical and theological lessons for the Church where they should not be looking for them: in the American cultural and political experience of democracy and individualism.
The Jesuits combined missionary zeal and a great education with Catholic doctrine.
No. Priestly celibacy is a discipline of the Catholic Church, not a doctrine. There are married Catholic priests. More information below:
Congregation for the Doctrine of the Faith
Yes, according to Catholic doctrine, a priest has the authority to forgive sins through the sacrament of confession or reconciliation.
A Doctrine. A Dogma is a teaching of the Catholic Church that we MUST believe.
No, Catherine changed no doctrines of the Catholic Church.
martin Luther
Because of his heliocentric beliefs.
The pope cannot change Catholic Doctrine.
The BALTIMORE catechism
heresy
The doctrine of "once saved, always saved" is not compatible with Catholic beliefs. The Catholic Church teaches that salvation is a lifelong journey that requires ongoing faith, good works, and cooperation with God's grace.