The Mexican army finally won the battle of Cinco de Mayo. At what point did the French decide to back down and surrender?

Why did roosevelt support a europe first strategy even though it had been japan that had first attacked the us

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France allied itself with america because a -the american rebels had modeled their movement after the french revolution b- france wanted to weaken britain c- france wanted to wanted to regain louisiana d- the french needed american support in their war with the native americans