This is actually a real advertisement for rat poison from the late 1800s. And if you see under the word "Clears" — very small — it says, "They must go," which refers not only to the rats, but to the Chinese in their midst, because the way that the food was perceived was that these people who ate foods different from us must be different from us.
Este es un anuncio real de veneno para ratas de finales del siglo 19, y si miran, bajo la palabra "Clears", muy pequeño, dice: "Se deben ir", lo cual no se refiere únicamente a las ratas, sino también a los chinos entre ellas, porque la forma en que la comida era percibida era que esta gente que comía comidas de manera diferente a nosotros debe ser diferente de nosotros.