The War of 1812 (1812-1815): This war was fought between the United States and the British Empire for various reasons, including territorial disputes, trade restrictions, and impressment (the forced recruitment of American sailors into the British navy).
The Revolutionary War (1775-1783): This war was fought between the thirteen American colonies and the Kingdom of Great Britain. The colonists sought independence from British rule, which led to the establishment of the United States.
Other notable conflicts between the UK and the US include the War of 1812 (1812-1815), the Barbary Wars (early 19th century), and various disputes over trade and territory in the 19th and 20th centuries. However, the UK and the US have also had periods of cooperation and alliance, including their close relationship during World War I and World War II.