Many years ago someone coined the phrase "When in Rome, do as the Romans", or something to that effect. When I lived in Europe in the 1960s, Americans simply followed the local custom.
When did it change and why? And not just in Rome, but seemingly in all of Europe. Was it because some ( but not all) Americans insisted on tipping our way because we thought our way was always right? Or was it motivated altruism, guilt, or ???
Not meaning to start WWIII, just asking for other's opinions as to why you think things changed so much.