Since a number of them were Jewish, I would say "Judeo-Christian" ethics.
YES...and the point being, they were not cultural or social nomads without respect or allegiance for anything. They were not coming here to freeload and despise their host nation!
The ‘immigrants’ coming here now want the most for the least effort and will never give full allegiance to America. They will assimilate ONLY enough to get what’s free and will avoid all/any personal effort in the process.