The cultural etiquette of various places looks exactly the same in modern times. The primary causes of this might be city planners of different economic and commerce hubs throughout the world, employing similar architecture styles, and also, currently we live in a globalized village where ideas travel at near light speed, similarly the culture in this globalised village travels from one economic hub to another, and the successful ideas are emmulated by all the other cultures across this world. I believe this has been a positive trend, as people from diverse backgrounds have something in common across this globe.