Why is a U.S. passport necessary when traveling abroad?

A U.S. passport is an essential document for anyone traveling abroad because it serves as a universal form of identification that confirms your citizenship and identity. When crossing international borders, governments require travelers to present a passport to ensure that they have the legal right to enter and exit their country. This document is recognized worldwide and enables officials to verify an individual's identity, citizenship status, and, importantly, their eligibility to travel.

A passport does not facilitate the purchase of foreign goods, nor does it play a direct role in applying for loans or guaranteeing accommodations. Therefore, while it’s critical for border crossings and proving citizenship, it does not serve functions related to commerce, financing, or housing when traveling. Understanding the primary role of the passport as a means of identification during international travel underscores its importance for anyone planning to visit another country.