Technically, the British didn't.
American history after the revolution was distorted as the new free Americans destroyed British documents in America.
However the historic documents still exist as evidence here in England itself.
The troops used to fight against the American Revolution all belonged to the British Commonwealth.
The British Commonwealth (then known as the British Empire) is lead by the Monarch of Britain (currently Queen Elizabeth 2nd).
Amongst the powers the head of the commonwealth has, is the authority to command troops which belong to Another Country, which is a member of the British Commonwealth.
"Hired" is the wrong word.
The troops were under the direct authority of the British Monarchy, they belonged to the British Commonwealth (British Empire back in those days).
Even today, the Head of the British Commonwealth (the serving Monarch in England) still has authority over military assets in countries who are members of the Commonwealth.
They hire them because King George III was determined to defeat the Americans.
They hire them because King George III was determined to defeat the Americans.
They hire them because King George III was determined to defeat the Americans.
They hire them because King George III was determined to defeat the Americans.
They hire them because King George III was determined to defeat the Americans.
They hire them because King George III was determined to defeat the Americans.
They hire them because King George III was determined to defeat the Americans.
They hire them because King George III was determined to defeat the Americans.
They did that because king george need more money.
The Revolutionary War.
The US fought the British in the American Revolutionary War and the War of 1812.
British