I need help...Again. ;-; Which explains how Bernardo de Gálvez affected the American Revolution? De Gálvez helped to draft the 1783 Treaty of Paris, which ended the Revolution. De Gálvez led Spanish forces north, which aided colonists who defeated the British. De Gálvez helped to draft the 1763 Treaty of Paris, which gave control of Spain to Florida. De Gálvez led Spanish forces to New Orleans, where they defeated the British and regained control of the Mississippi.