Of course the situation is different in the US because the Catholic Church has never been the religion favored by the government.
Unfortunately a lot of the Catholic bishops have been the enablers of a lot of the developments they now fear, by their support of Democratic politicians.
The sled was going down the hill anyway but without a doubt they greased the skids. A good many of them seem to have taken Vatican II to mean that they could become a separate US Catholic Church in name and just another liberal Protestant denomination in reality. Had it not been for the enthusiastic support of a good many Bishops, Priests, and Nuns, as well as a good percentage of the Catholic folks in the pews, our current situation would probably have been delayed but I'm not sure it could have been avoided altogether.
Regards