Welcome to America, World Cup visitors. Don't forget to tip.

Millions of World Cup visitors are experiencing American cuisine for the first time and there's one menu item that's completely foreign: tipping.Why it matters: Many restaurants in World Cup host cities are adding 20% gratuities to customers' bills this summer to accommodate international fans who might otherwise accidentally stiff their servers.What they're saying: Teneshia Murray Butler, owner of the Atlanta-based chain T's Brunch Bar, tells Axios she raised the restaurants' automatic gratuity...