The United States declared war on Britain in 1812. It did so because Britain refused to stop seizing American ships that traded with France—Britain's enemy in Europe. Sometimes there were also seizures of American sailors. These seizures were known as impressment.
Also asked, who declared war on Great Britain?
1939: Britain and France declare war on Germany. Britain and France are at war with Germany following the invasion of Poland two days ago. At 1115 BST the Prime Minister, Neville Chamberlain, announced the British deadline for the withdrawal of German troops from Poland had expired.
What started the war of 1812?
Causes of the War of 1812. At the outset of the 19th century, Great Britain was locked in a long and bitter conflict with Napoleon Bonaparte's France. In an attempt to cut off supplies from reaching the enemy, both sides attempted to block the United States from trading with the other.
When was the start of the War of 1812?
June 18, 1812 – February 18, 1815