The formal declaration of war by Great Britain against France in 1756 was a significant moment that escalated the Seven Years' War. This conflict emerged as a result of ongoing global competition between Britain and France, fueled by colonial ambitions in North America, the Caribbean, West Africa, and India. Tensions had been mounting for years as both nations struggled to expand their respective empires, with skirmishes in the Ohio Valley and other frontier regions contributing to the growing animosity. The British, under the leadership of figures like Prime Minister William Pitt, sought to aggressively counter French encroachment on territories claimed by British settlers.

The aftermath of Britain's declaration saw the mobilization of large scale military forces and the establishment of strategic alliances. Britain's approach included not only direct confrontation with French forces but also recruitment of various indigenous allies. The war quickly spread beyond North America, drawing in continental Europe, India, and the Caribbean. France was not just facing Britain but also emerged involved in battles against various European coalitions, which saw multiple nations either allied with or against either of the two powers throughout the conflict.

The war represented one of the first instances of a truly global conflict, with different theaters of war impacting colonial territories on several continents. The fervent nationalist sentiments kindled by military campaigns and the expansion of territories would also contribute to shaping future relationships and conflicts between the nations involved. The conflict's resolution revealed the pivotal shift in global power dynamics, particularly disadvantaging France, which would subsequently influence its role in the world stage for decades to come.