One of the reasons tipping spread in the U.S. was because restaurant owners refused to pay black Americans after the 15th amendment.
‘It’s the Legacy of Slavery’: Here’s the Troubling History Behind Tipping Practices in the U.S. These days, the expectation at U.S. restaurants that diners will tip their servers is a key part of the culinary economy: tips subsidize a server or bartender’s salary at the vast majority of the nearly 650,000 restaurants in the country. […]