I always thought the fried rice has some kind of American influence. Indeed it has a fascinating history and is crossover food.
The common explanation and assumption is that the U.S.A. abbreviation stands for Udang (Shrimps), Sotong (Squid) and Ayam (Chicken). There's also an omelette on top or wrapped around the fried rice.
Its real origin or influence ought to be the American Fried Rice (ข้าวผัดอเมริกัน) dish, invented by the Thais during the Vietnam War.