Answer:
The War of 1812 began because the British were interfering with American trade and impressing American seamen.
Step-by-step explanation:
The War of 1812 was a conflict that confronted the United States against the United Kingdom and its Canadian colonies that developed between 1812 and 1815. The clashes occurred by land and by sea.
At a time when Great Britain had to endure a great war effort to confront Napoleonic France, on June 18, 1812 the United States declared war on it in order to invade the Canadian territories belonging to the British Empire. These had been populated for forty years by English speakers and maintained numerous cultural and commercial relations with the United States.
Among other causes of the war were the restrictions on trade imposed by the United Kingdom because of the war it maintained in Europe against France, the forced recruitment of US merchant sailors to serve in the Royal British Navy and British support for indigenous peoples of North America that opposed the expansion of the United States.