![](https://upload.wikimedia.org/wikipedia/commons/d/d7/1888-01-22%2C_La_Ilustraci%C3%B3n_Espa%C3%B1ola_y_Americana%2C_El_censo_de_poblaci%C3%B3n%2C_Alc%C3%A1zar.jpg) Branch of science that studies society and its relationships