I live in the US and I know it's a big country, so I can only speak for my little slice of the country, but we've always had vegetarian & vegan options at our restaurants, and only recently has plant based meat entered into the picture. Lots of food brought to the US from other places, like Mexico, China, India, Italy, etc. is already vegetarian or vegan, so we don't need to have fake sausage on a restaurant menu when we can have huitlacoche quesadillas, sesame noodles, chana masala, tomato pie, or vegetarian variations of other dishes.