* Political and religious freedom: The United States was known for its commitment to religious freedom and its democratic political system. This attracted immigrants who were fleeing political or religious persecution in their own countries.
* Social mobility: The United States offered a more fluid social hierarchy than many European countries, with greater opportunities for social advancement. This appealed to immigrants who wanted to escape the rigid social structures of their homelands.
* Adventure: The United States was seen as a land of adventure and opportunity, with its vast open spaces, its frontier spirit, and its many natural wonders. This appealed to many immigrants who were seeking a new and exciting life.