As a kid in school, I just thought american was america and a great place to live in....But with a catholic education, you were taught better than us public school kids...my husband went to St Thomas until the 10 grade and the nun’s asked him to leave, then he went to Aero-mechanics for 1 year and they asked him to leave. His senior year at Pershing High school was went I met him....he said the stuff they were teaching seniors he got in the 10th grade at St Thomas before he and 3 of his friends were asked nicely to leave....those nuns knew how to teach....
I and my brother went to a German Lutheran grade school. There are many private schools associated with or sponsored by different religious affiliations. Our grade school was very pro USA including the ladies organization that sponsored many events particularly sauerkraut lunches. When WWII was breaking and actually broke I never sensed any qualms about fighting Japan and Germany.