Answer:
The United States went to war against Great Britain in 1812 for the following reasons:
the belief (not entirely incorrect) that the British government was supporting, even encouraging, Native attacks along the Northwest frontier.
the impressment of American sailors by the British navy.
Step-by-step explanation:
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.
In the War of 1812, caused by British restrictions on U.S. trade and America's desire to expand its territory, the United States took on the greatest naval power in the world, Great Britain.