Actually the Liturgy was NOT changed in Vatican II. It remained that the Latin was the main form of the Mass.
It was Bishops, especially American Bishops who went haywire. May God forgive them and lead them back.
The Liturgy was changed drastically. According to this Cardinal and others ... “a striking departure from Catholic theology”.
Read this:
http://www.ewtn.com/library/CURIA/REFORMOF.HTM