The war of 1821 is associated with the conflict between the United States and the United Kingdom. Both of them also had their allies to fight alongside them.
Step-by-step explanation:
According to the perspective of the US, there were various reasons such as the cutting of the trade from France in response to the war against Napoleon France which was against the international law and doing all this by forcefully recruiting American sailors in their naval blockade of sea trade, Chesapeake–Leopard affair: US warship Chesapeake attacked by British ship Leopard, and many other. One thing led to another and the war was the result. Both the participants were actually satisfied with the results.
Personally, I don’t think war is a solution to any problem but as we know exceptions are always there sometimes war is the best way and sometimes it’s the worst way that you can ever imagine.