Not exactly a Vatican II document…
Pope Pius IX condemns Anti-Christian Civilization: Exclusive English Translation of Allocution Iamdudum Cernimus (1861)
The Supreme Pontiff Pius IX (reigned 1846-1878)
Virtually everyone who considers himself a traditional Roman Catholic has heard of Pope Pius IX’s famous Syllabus of Errors. It is a list of some of the chief philosophical, theological, and socio-political errors of the 19th century. A total of 80 condemned theses, the list was appended to the encyclical Quanta Cura and released together with it on Dec. 8, 1864.
With regard to how the Syllabus came to be, the Catholic Encyclopedia explains:
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The commission [for the creation of the Syllabus] took the wording of the errors to be condemned from the official declarations of Pius IX and appended to each of the eighty theses a reference indicating its content, so as to determine the true meaning and the theological value of the subjects treated.