How did the XYZ Affair lead to an undeclared war with France?

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What do you mean? @Cat1864

We cannot and will not do your work for you.

What have you been taught about the subject? What have you found out when you looked it up/searched for it?

(And this goes for all of your questions.)

What do you mean? @Cat1864

It means that we won't do your homework. Show the work you've done, the answer you have, and we'll take a look at it, tell you where you went wrong, where you went right. But we won't tell you the answer. This is your homework, not ours.