We're true to our roots subway started small in the usa before becoming the largest string of sandwich shops in the world. Always made fresh to order. The u.s. Restaurant industry has grown significantly over the last half-century. Food and drink sales in the 1970s were pegged at $42.8 billion. In 2017 this figure had risen to $799 billion and expected to increase. Restaurants cater to a wide variety of tastes from casual to formal.