Great Britain came to have, in 1778, in North America, about 50,000 well-trained
soldiers, about 18,000 mercenaries Germans they hired for the race; they used half of his powerful fleet; inflicted a series of initial defeats of the settlers, and
faced an inexperienced army, but the war was not a "triumphant ride" for the British, as they predicted. The Americans were successful in shunning open
battles and attacking with skirmishes; that made them more dangerous than "if they had a large regular army." It was key, for the revolutionaries, the
development of the Pennsylvania model rifle, of great precision from more than 80 meters. It was a more effective weapon than the ancient and imprecise
muskets. The defeat of the British in Saratoga,
north of New York, in October 1777, was important. From there, France
arrived openly in the war: supported vrebels with money, arms, and
ammunition, was still reluctant to direct intervention.
But a year later, they declared war on England, after a secret agreement with France. Later, Holland also joined the coalition formed by Spain and France.
In 1781 they surrendered the last English redoubt in Yorktown, in front of a French fleet and a combined French-American army of 16,000 men, under the command
of George Washington. On September 3, 1783, the treaty was signed by which Great Britain recognized the independence of the United States and returned to
Spain, France, and Holland several possessions, although Canada maintained.
George Washington was elected the first president of EE. UU in 1789, under the
terms of the Constitution of 1787, and the oldest in the world, because it is maintained until now with only a few amendments.