England declares war on France, officially launching them into the Seven Years' War, a global conflict played out in North America as the French and Indian War. However, fighting and skirmishes between England and France had been going on in North America for several years.
In the early 1750s, French expansion into the Ohio River valley repeatedly brought France into armed conflict with the British colonies. In 1756—the first official year of fighting in the Seven Years' War—the British suffered a series of defeats against the French and their broad network of Native American alliances. However, in 1757, British Prime Minister William Pitt (the older) recognized the potential of imperial expansion that would come out of victory against the French and borrowed heavily to fund an expanded war effort. Pitt financed Prussia’s struggle against France and her allies in Europe and reimbursed the colonies for the raising of armies in North America.