France–United States relations

The Kingdom of France was the first country to have diplomatic ties with the then-nascent United States, with the 1778 Treaty of Alliance and subsequent French aid proving decisive in American victory over Great Britain in the American Revolutionary War. French–United States relations have remained peaceful since, with the exceptions of the Quasi-War and American combat against Vichy France (while supporting Free France) during World War II. In 1803, the United States purchased the territory of Louisiana from France to acquire a total of 828,000 sq mi (2,140,000 km2; 530,000,000 acres) and expand westwards.

Source: Wikipedia — France–United States relations (CC BY-SA 4.0)