The United States of America, commonly known as the United States (U.S. or USA), is a federal republic primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations.
Spanning approximately 3.8 million square miles, the United States is the world's third-largest country by total area. It shares land borders with Canada to the north and Mexico to the south, with coastlines along the Atlantic Ocean to the east and Pacific Ocean to the west. The country features diverse geography ranging from vast plains and rugged mountains to dense forests and arid deserts.
With a population exceeding 335 million people, the United States is the third most populous country globally. The nation is characterized by its remarkable ethnic and cultural diversity, with people from various backgrounds contributing to the rich tapestry of American society.
The United States operates as a federal republic with a strong democratic tradition. The government is structured around three distinct branches:
The U.S. Constitution, adopted in 1787, remains the supreme law of the land and has been amended 27 times to reflect the evolving needs of the nation.
The United States boasts the world's largest economy, with a gross domestic product exceeding $29 trillion in 2024, accounting for over 25% of global economic output. The country maintains a highly developed mixed economy characterized by:
The U.S. dollar serves as the world's primary reserve currency, and American cultural influence extends globally through entertainment, technology, and business.
The United States is home to many of the world's top universities and research institutions. The country leads in scientific research and technological innovation, with significant contributions to fields including:
American culture reflects the nation's diverse heritage and has had a profound global impact through:
As of late 2025, the United States continues to navigate various challenges and opportunities:
The United States maintains its position as a global leader while addressing domestic priorities and international responsibilities in an increasingly interconnected world.
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