However relations between the colonists and the mother country turned sour after 1763. The British had just finished fighting the Seven Years War against France. They had won Canada but the war was very expensive. The British were keen to prevent any wars with the Native Americans, which might prove expensive. In 1763 a royal proclamation known as the Great Proclamation sought to ban any further westward expansion. It forbade people to settle in 'any lands beyond the heads or sources of any of the rivers which fall into the Atlantic Ocean from the West or Northwest'. This proclamation was ignored by the colonists but it also caused great resentment. The colonists objected to being told by the British government that they could not expand westwards.