Neither France or Spain helped the American Revolution for altruistic reasons. Both countries wanted to retaliate against Great Britain which had become a global power after these countries were defeated in the Seven Years War and the result of the Treaty of Paris in 1763. Important to know that Spain had territories in the American continents and it was a matter of importance.
Well France hated the English, so they helped the Americans. Spain on the other hand lost land when the English came along. So they wanted their land back. Hope this helps!
