There are facts, and then there are stories. Flashman seems to like reading history books too.
Several of my history books say Yorktown would never have been taken by the colonies had the french not blocked the british supply routes.
A very real reason we restored France in WWII, was because they were our allies, and we wanted Indochina in the hands of our allies. This went along with our open door policy in that area.
Also, Wilson claimed that we would remain neutral in the first world war, that it was possible for a country to be “too proud to fight”. America was making a lot of money in WWI (and II) shipping supplies to germany’s enemies. Germany stated they would sink any ships doing so, and after several merchant ships, and lastly the british merchant ship Lusitania, Wilson stated at that time that he must stand by the right of Americans to travel on merchant ships in the war zone. Wilson was forced to “find legal reasons for policies that were based not upon law, but upon the balance of power and economic necessities.” It was unrealistic to expect that the Germans should treat the U.S. as neutral in the war, when the US had been shipping great amounts of war materials to Germany’s enemies. I can go further on this if you like, but in short, America was troubled at this time with socialism and unions and everything else, and the leaders of our country at the time believed that the prosperity of our country depended much on foreign markets. U.S. interest in WWI was our own economy, and that’s about it.
As for involvement with WWII, it was when Japan threatened potential U.S. markets by it’s attempted take over of china, but especially as it moved towards the tin, rubber, and oil of SE asia, that the US put a total embargo on scrap iron, and later on oil also. Japan attacked, claiming these embargos were a “clear and potent threat to Japan’s very existence.” Records show that a white house meeting two weeks before pearl harbor anticipated a war, and planned on how to justify it.
Zinn, Howard A People's History of the United States. Harper Collins: New York 1999
Butow, Robert Japan's Decision To Surrender. Stanford: Stanford University Press 1954
Kolko, Gabriel. The Politics Of War: The World and United States Foreign Policy, 1943-45. Random House: New York 1968