Hi! Florida was obtained by Britain by treaty with Spain after victory in war. In 1762, during the Seven Years' War, a British expedition attacked and occupied Havana, the capital of Cuba. To secure the return of this valuable city, Spain agreed to cede its territory of La Florida to the victorious Great Britain under the 1763 Treaty of Paris. I hope this helps you! Good luck and have a great day/night. ❤️✨