Herein, why was impressment frowned upon by colonists?
As a cause of the War of 1812, the impressment and ship seizures caused serious diplomatic tension, and helped to turn American public opinion against Britain. Impressment was widely perceived as humiliating and dishonoring the U.S. because it was unable to protect its ships and sailors.
Secondly, what was impressment during the War of 1812? Of all the causes for the War of 1812, the impressment of American sailors into the Royal Navy was the most important for many Americans. Under British law, the navy had the right, during time of war, to sweep through the streets of Great Britain, essentially arresting men and placing them in the Royal Navy.
Similarly, you may ask, what happened to impressed sailors?
Those sailors who were press-ganged from American ships were treated the same as their colleagues. As their ships were paid off, they would receive their back wages (often a substantial sum of money, since wages were normally paid in arrears) and be set ashore in the ship's home port, free to do as they pleased.
Why did Britain seize US ships?
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. Britain finally suspended its orders against neutral trade, after a change in government.