Answer: their dependency on slave trade and domination of slave trade (caused by waging war)
Explanation: trust me
It's a because during the middle ages kingdoms conquer other nations by the numbers as soon as the child has education he (I say he because they didn't allow women to have education back then) he will enlist into one of the European nations and fight.
The freedom to create their own nation and government.
If you are talking about the Revolutionary War, I believe that the French brought the Patriots supplies when they were in need.
