Find a timeline of American history. It'll be hard to find a portion of it in which America hasn't messed with other peoples' business. The US felt entitled to everything even before it became the US.
Articles of confederation? I don't think anything happened during those. Unless you counted state to state arguments as international affairs (which they sort of were under the articles).
I can't think of anything either. But given that it lasted just under a decade since its full ratification and until the Constitutional Convention, it's not much. I never did say it was nonexistent, just rare.
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