Orthodox only survived in the USA due to 2 main reasons, one was the 5 day work week making it alot easier not to work on SHabbos (Most people evantually succombed to working on Shabbos when they were constantly fired, people gotta eat and pay the rent)
And in the 60’s when African americans got civil rights, other groups got iot too and it became ok to demand rights too and it became OK to demand religous freedom