The answer may surprise you. While a passport is not required for all travelers. It depends. If you're planning on staying in Mexico for less than 72 hours, then you don't need a passport. However, if you're planning on staying longer or leaving Mexico and returning at any point during your trip, then you'll need a passport. All American citizens are required to have a passport in order to travel to Mexico. If you don't have a passport, or if your passport has expired, you can apply for a new one.
While a passport is not required for all travelers, it is always a good idea to have one on hand in case of an emergency. If you're planning on traveling to Mexico, be sure to check the requirements for your specific destination. In some cases, a passport may not be necessary but it is always best to err on the side of caution and bring one just in case. So whether you're planning a trip to Cancun or Mexico City, make sure you have your passport ready to go.