Answer:
Common Enemy - Britain had become the major power in Europe and the rest of the world. Countries such as France and Spain saw Britain as their enemy. By aiding the Americans they were also hurting their enemy.
Step-by-step explanation:
reason for France and Spain to aid the Americans in the Revolution?
Spain's motivation to help the American colonists was driven by a desire to regain the land it had lost to Britain and, with other European powers, make incremental gains against British possessions in other parts of the world.