It is true. My thesis is that the feudal system is the most organic to the Divine Law and therefore to the Catholic Church social system, while a democratic state can be compatible with Catholicism, and the American Republic in its ideal form is compatible. The latter, compatibility, is what various popes taught, and you quote some of them. But "compatible" only means that the Church can do her work in America and in the USSR or communist Poland, for example, she (or the sister Orthodox Church) could not. It does not mean that the real conditions -- as opposed to the ideal frozen in time form -- cannot deteriorate to the point when the compatibility vanishes. Or vice-versa, an atheist communist state may remove enough obstacles to the Church and become relatively compatible.
There are ominous signs that the real democratic system is turning from welcoming or neutral to hostile toward religion, both in Europe and in the United States. The legal notion that religion cannot exist in any public space has prevailed. Various freedom of conscience protections as regards abortion or homosexuality are rapidly disappearing, even as the innovations such as gay "marriage" and abortion pill make these protections even more necessary. The Catholic duty of a justice of the peace asked to certify a gay "marriage" is to refuse to do so and to refuse to resign over it; likewise with doctors, nurses and pharmacists who may be mandated to serve the abortion and contraception industry. Is there any doubt that the state will respond with hostility to conscientious objectors as soon as the transitional period of legal fog that we currently have over these issues clears? The compatibility will end when it happens.
Of course, establishing monarchy through, say, a constitutional amendment is a fruitless cause. It will only establish itself following a major crisis and collapse of authority. Or a new feudalism will emerge from the system of private enterprise after the state fails. Moreover, re-establishment of hereditary nobility should probably precede the establishment of monarchy. But I do not call for establishment of either. I urge the conservative wing of the Catholic Church in the West to understand that the modern democratic state is rapidly emerging as the enemy of the Church and to adjust its rhetoric accordingly.
Sure it will be hard but the left accomplished it and we more virtuous Christians, Jews, and principled secularists can win the war but it first must be fought within our own minds.
If we let ourselves become convinced "it is over" in our minds, we have surrended to despair and defeat.
Mary appeared at Guadalupe,in the very center of the Americas, for a reason.
Despite those who hate us, we are destined for real greatness if each of us, individually, picks up the mantle and does our part.
P.S. I don't know what you meant by "It is true"