Urbanization in the United States refers to the increasing population shift from rural areas to cities. This trend began in the 19th century, driven by industrialization, which created job opportunities in urban centers. As a result, cities like New York, Chicago, and Los Angeles grew rapidly, attracting people seeking better economic prospects and living conditions. Today, over 80% of the U.S. population lives in urban areas. This shift has led to changes in infrastructure, housing, and transportation. Urbanization also presents challenges, such as overcrowding, pollution, and the need for sustainable development to accommodate growing populations while maintaining quality of life.