Even after the Independence of the American colonies, their relationship with Great Britain was always shaky. Things came to a new low when the British decided to aid native Indian tribes who wanted more sovereignty from Washington DC.
Also, impressment was when British naval ships would travel across the Eastern US shores and force young men into service. Not only was it illegal, it was making it very difficult for the United States to build a proper Navy.
Both these were seen as aggressive and increased American resentment of the British.
