Americanism has been addressed by Holy Mother Church, and Pope Leo XIII had dedicated an entire encyclical to dealing with problems associated with this error.
Here is an excerpt:
The underlying principle of these new opinions is that, in order to more
easily attract those who differ from her, the Church should shape her teachings
more in accord with the spirit of the age and relax some of her ancient severity
and make some concessions to new opinions. Many think that these concessions
should be made not only in regard to ways of living, but even in regard to
doctrines which belong to the deposit of the faith. They contend that it would
be opportune, in order to gain those who differ from us, to omit certain points
of her teaching which are of lesser importance, and to tone down the meaning
which the Church has always attached to them. It does not need many words,
beloved son, to prove the falsity of these ideas if the nature and origin of the
do...