Do you have any evidence that FDR loved war or that Japan would have surrendered in 1943 except for the unconditional surrender?
Japan might have made peace in 1943 but only if we allowed Japan to take the parts of the Pacific she wanted. So the war came down to America supplying Japan with the war materials to make war in China or allow her to take the war materials from other nations, including the American Philippines.
Don't you believe FDR tried to negotiate with the Japanese? If you check you might discover we were in the midst of negotiations when Pearl Harbor occurred. We did not order Japan out of China on the threat of war but only that we would not sell Japan any more materials to make that war.
As for the Wilson quote: WWII was the last American war the legislature voted a formal declaration of war as per the Constitution.
Do you really think FDR wanted peace when he ran for a ridiculous third term even though his health was questionable? He told the American people in the 1940 campaign that he would not get us involved...yet he already had us involved. He was giving all sorts of material to the Brits and trying to cause a confrontation in the North Atlantic. He also had allocated millions to build up our war machine. As such, he was a pro-war progressive and a liar.
I do not believe FDR did all he could to negotiate with Japan. As I stated, FDR pushed Japan into an intolerable position, which lead to their attack on Pearl. Which was exactly what FDR wanted.
My view is our leaders must avoid war at all costs. Not only is war deadly with unbelievable suffering (though our leaders never suffer), it always results in unintended consequences...like the Soviets enslaving half of Europe after WWII even though the war started to free Poland from Germany....what a waste. And war always centralizes power into the hands of a few elites.
If you search the record, you will find that Japan sought peace terms as early as 1943. But, thanks to FDR's absurd unconditional surrender requirement, it went nowhere.
And you misunderstand the Founder's quote...he hoped the Constitution would prevent exactly what FDR did. That one foolish egotistical pro-war POTUS could not take unilateral actions that would lead us to war...but he did with his aggressive actions and unwillingness to negotiate to avoid war.