In WWI the naval and economic interests of the US were at stake and this is how the US was convinced to join (in late 1917) the French and British armies fighting since 1914.
In WWII France had been already defeated and Great Britain suffered an ordeal under German air strikes before the Pearl Harbor attack convinced the US to stand with their European allies.
The Battle of Saratoga.
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France and Great Britain
It convinced the French to recognize American independence and provide military aid.
After the American victory at the Battle of Saratoga.
It was the end of religious wars that allowed France to join in the scramble for colonies. France was in competition with Spain to build an empire in America.
Well, in WWII, America was an ally with France so they didn't declare war on France. Although America didn't start war on Italy (one of their enemies in WWII), because America didn't want to join the war. They thought it was too dangerous.
"We were convinced that it would be to their advantage to join the club"
England, France, Germany, United States of America.
Dwight D. Eisenhower
The Battle of Saratoga (second, October 7, 1777) is often seen as the turning point in the American Revolution. The victory in this battle convinced France to join the cause, and France's assistance during the war was critical to an American victory.
The Governments of France, Britain and America. Germany was not allowed to join the discussion of what went into the Treaty of Versailles.