I know you and I would more than likely disagree on foreign policy, since I have long been a pacifist and non-interventionist.
My foreign policy rests on the golden rule, treat others how you would wish to be treated. Since I would not want Washington to be dictated by Berlin, I would just as well avoid doing the reverse. As president, I would avoid war whenever possible, instead favouring negotiation and diplomacy, and only waging war as a last resort, and if we are under imminent threat of being attacked.
My opposition to the League rests on the same point Mr. Nightmore has made; unless we throw all our weight behind it, and are willing to wage war after war, often in the name of French or British imperialism, tied with a nice bow or liberty or civilization, then the League will fail. Moreover, if we join, and are not fully committed to sending our men to die in Europe's wars, then our relations with fellow members would deteriorate, while not improving our standing with non-League nations. As well, if we are not committed fully, the League will be viewed as impotent and will likely cause only more needless wars.
My solution is based on the system devised by our founders; we will form our relations, based on trade and commerce, at our discretion. We may work in collusion with the League at times, but we should, at all times, remain free from any foreign influence. Under my administration, I would support strong trade relations with France, Britain, Germany, Italy, Russia, and all the other major nations, with a goal of expanding our trade network globally. At the same time, I would oppose involving America herself in wars concerning Europe. America would follow the principles of our venerable founders, one where we are friendly and trade with all nations, but where we bind ourselves to no one in particular.
On the resolution of this war, I could support plebiscites in the Empire's, as well as support democracy, so long as the people want it. If not, they would likely elect a far worse tyrant. I would oppose any measure by the French or British to punitively destroy any of the Empires, and would support a lenient peace treaty, one where the European's can create a League of European State's to resolve European issues. in that way, we would promote peace and negotiation, without having to foot the bill or tie ourselves needlessly to the affairs of Europe.