Atlanta is the capital city of Georgia and the cultural and economic center of its metropolitan region. It has a population of over 447,000, making it the most populous city in the state. Atlanta was established in the 1830s as a railroad hub and grew significantly after the Civil War. In the late 20th century, it gained international prominence for its progressive views during the Civil Rights Movement and as a major southeastern transportation center, with its airport being the world's busiest since 1998. Atlanta has a diverse economy focused on logistics, professional services, media, and technology and its revitalized neighborhoods have altered the city's demographics and culture in recent decades.