Which of these wars did the United States fight in the 1800s?

1. The wars the United States fought in the 1800s were the War of 1812, the Mexican-American War, the Civil War, and the Spanish-American War. 2. The Mexican-American War is on that list, so it is the answer. 3. The First World War and the Second World War were both fought in the 1900s. 4. The Persian Gulf War came later still and also belongs to the 1900s. 5. All four options name real wars the country fought, so only the century separates them. 6. Reading the century in the question is what makes this one answerable. _Source: USCIS Civics Flash Cards M-623 (rev. 02/12), public domain, official civics question 72_