The provided source text does not contain information on how Mexico settled its debts with the U.S. Historically, major financial settlements between the two nations include the Treaty of Guadalupe Hidalgo (1848), which ended the Mexican–American War and involved a $15 million payment to Mexico, and the Gadsden Purchase (1854), where the U.S. paid $10 million for additional territory. Later debt restructurings occurred in the 20th century, but specific details are not covered in the given context.