The statement that best describes a key factor that affected Latin American efforts to industrialize after World War II is:
Latin American countries had systems to protect their own industries, but could lose profits because of costs other countries placed on their goods.
This reflects the challenges that many Latin American countries faced in trying to develop their industries while also dealing with international trade barriers and competition. Protectionist policies were implemented to foster local industries, but they still contended with external pressures and costs that could hinder growth and profitability.