Assuming you mean the American Colonies against England:
France and England had previous tension with each other (hence the French and Indian war, where France hired the Native Americans to attack English settlers in the American Colonies) so, when the Americas told France of their endeavours and convinced them that they were a substantial force, France hopped on board seeing an opportunity to attack England.
The French colonies in the New World (Canada, but not only) were called "la Nouvelle France" (New France in English).
Most colonies were developed in New France because of fur trading and resources such as medical items.
He became convinced that his life and that of his family was in danger.
France.
Lexington and concord
France.
It was the end of religious wars that allowed France to join in the scramble for colonies. France was in competition with Spain to build an empire in America.
The Battle of Saratoga.
The American victory at Saratoga. Not only did it stop the plan of Britain cutting off New England for each region of the colonies to be crushed in turn, but it also convinced France that the USA could win the war. Thus, France joined, adding a strong navy and ground force support.
He was an ambassador for the colonies trying to gain France's support to enter the war on our side (Americans).
France expected that their colonies would always be part of France. Britain trained their colonies to be self-governing.
He was the colonies' ambassador to France and convinced the French government to fight alongside the Americans against the British. He published pro-American books and a newspaper. He served on the Continental Congress. He was instrumental in the planning of our system of government. He was one of the Founding Fathers and one of the American representatives signing the Treaty of Versailles. He was respected by everyone and his huge decision to support the colonies in the pursuit of independence was incredible.
France
France expected colonies would always be apart of France.
When Joan was finally convinced that she was called by God to save France, the first person she went to was the local Lord, Robert de Baudricourt, whose castle was at Vaucouleurs.
Britain and her colonies, Poland, Norway with support but no real fighting from the Usa.
Britain's North American colonies all supported Britain in the American and Indian War. Please note that in 1755-63, the 13 colonies were not an established group of the kind implied in the question.