Relations between the Kingdom of Morocco and the United States date back to the earliest days of U.S. history. Morocco was the first country in the world to recognize the independence of the United States in 1777, and remains one of America's oldest and closest allies in the Middle East and North Africa. Formal U.S. relations with Morocco date from 1787 when the U.S. Congress ratified a Treaty of Peace and Friendship between the two nations. This treaty is still in force, making it the longest unbroken treaty relationship in U.S. history, and Tangier is home to the oldest U.S. diplomatic property in the world. Morocco is also one of the few countries in Africa to extend visa-free travel to American citizens.