To compare Mexico's and Argentina's economic success post-World War II, the most accurate statement from the provided responses is:
They both nationalized industries that were economic problems.
This is true because both countries pursued nationalization as a response to economic challenges. Argentina nationalized several key industries, including railroads and utilities, especially during periods of Peronism, while Mexico nationalized its oil industry in the 1930s, which continued to influence its economy post-World War II.
The other options do not accurately represent the economic histories of Mexico and Argentina after World War II. The United Fruit Company primarily affected Central American countries rather than directly influencing the broader economies of Mexico or Argentina. While both countries have significant oil sectors, they did not both create national oil industries at the same time or in the same context, and they did not rely solely on foreign companies for wealth generation as they pursued different economic models.