What was the primary reason the seven year war was fought

Hi! The primary reason the Seven Year War was fought is that 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. I hope this helps you! Good luck and have a great day/night. ❤️✨