The logo depicts a political party in Mexico during the twentieth century. A logo for the P R I political party in Mexico consists of a circle on a gray background. The circle is made from 3 vertical stripes: one green, one white, one red. In the green stripe is a white letter P, in the white strip is a black letter R, and in the red strip is a white letter I. Based on the logo, which party dominated Mexican politics throughout the 1900s?