They crossed the border to help fight.
Answer: The founding fathers
Explanation: the founding fathers were Alexander Hamilton, Benjamin Franklin, John Adams, Samuel Adams, Thomas Jefferson, James Madison, John Jay, and George Washington himself
Prohibiting the export of arms, ammunition, and implements of war, from the United States to foreign nations at war
I'm not sure if you made a typo or not but in the current context I can only see negligible being relevant.