Despite a number of disagreements, by 1763 Anglo-American ties seemed stronger than ever. The colonies had prospered under British rule, had developed local institutions through which they seemed to govern themselves, and with the defeat of France, appeared ready to expand into the heart of the continent. No sooner was the war ended, however, than the British began to alter the pre-1763 system in an effort to make it more efficient and more responsive to control from London. The means chosen to do so⎯enforced regulations to end the illegal trade that had flourished under salutary neglect, plus taxation to pay for the colonial administration⎯were seen by the colonists as threats to the way of life they had come to accept as rightfully theirs. Rising in protest, the colonies faced a British government determined to assert its authority, and with neither side willing to give in, the cycle of action and reaction continued. Finally, spurred by a propaganda campaign that characterized the mother country as a tyrant determined to bring America to its knees, the colonies acted. The Intolerable Acts proved the final straw, and in September 1774, twelve British provinces met in a Continental Congress in hopes that a united front would cause London to reconsider and that conflict would be avoided. But it did not work. In the spring, fighting broke out at Lexington and Concord. Although independence was not yet declared, the American Revolution had begun.