His writings on things like socialism and americanism apply to what we see today
From Pope Leo XIII on Socialism...
QUOD APOSTOLICI MUNERIS
http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_28121878_quod-apostolici-muneris_en.html
“This kind of error, which falsely usurps to itself the name of reason, as it lures and whets the natural appetite that is in man of excelling, and gives loose rein to unlawful desires of every kind, has easily penetrated not only the minds of a great multitude of men but to a wide extent civil society, also. Hence, by a new species of impiety, unheard of even among the heathen nations, states have been constituted without any count at all of God or of the order established by him; it has been given out that public authority neither derives its principles, nor its majesty, nor its power of governing from God, but rather from the multitude, which, thinking itself absolved from all divine sanction, bows only to such laws as it shall have made at its own will. The supernatural truths of faith having been assailed and cast out as though hostile to reason, the very Author and Redeemer of the human race has been slowly and little by little banished from the universities, the lyceums and gymnasia-in a word, from every public institution. In fine, the rewards and punishments of a future and eternal life having been handed over to oblivion, the ardent desire of happiness has been limited to the bounds of the present. Such doctrines as these having been scattered far and wide, so great a license of thought and action having sprung up on all sides, it is no matter for surprise that men of the lowest class, weary of their wretched home or workshop, are eager to attack the homes and fortunes of the rich; it is no matter for surprise that already there exists no sense of security either in public or private life, and that the human race should have advanced to the very verge of final dissolution.”
From Pope Leo on Americanism....
TESTEM BENEVOLENTIAE NOSTRAE
http://www.ewtn.com/library/PAPALDOC/L13TESTE.HTM
“”From the foregoing it is manifest, beloved son, that we are not able to give approval to those views which, in their collective sense, are called by some “Americanism.” But if by this name are to be understood certain endowments of mind which belong to the American people, just as other characteristics belong to various other nations, and if, moreover, by it is designated your political condition and the laws and customs by which you are governed, there is no reason to take exception to the name. But if this is to be so understood that the doctrines which have been adverted to above are not only indicated, but exalted, there can be no manner of doubt that our venerable brethren, the bishops of America, would be the first to repudiate and condemn it as being most injurious to themselves and to their country. For it would give rise to the suspicion that there are among you some who conceive and would have the Church in America to be different from what it is in the rest of the world.””
The idea that men could self-organize into a just society either through democratic means (liberalism) or by favoring the most numerous social class (marxism), is a foolish project either way.