Without Hitler we wouldn't have many of the international frameworks we take for granted today: the UN, NATO or the EU. Japan would likely have continued its aggression towards China and Korea, with the US unwilling to intervene. The US wouldn't have landed on the moon, as there would have been no space race and they wouldn't have had the Nazi scientists to help them. A lot of the technology we take for granted simply wouldn't exist. Socially the war brought people together and united them behind a nationalist vision, so it's very likely that without it we wouldn't have seen the NHS and other universal healthcare systems. In the US patriotism wouldn't be as strong and we wouldn't have seen the reference to "Under God" added to the Pledge of Allegiance.
Anti-American sentiment is warranted when you're talking about the United States' nuking of civilian targets during WWII - Hiroshima and Nagasaki were war crimes. And America has mostly been willing to fight and die for itself - it had absolutely no interest in WWII until the attack on Pearl Harbor and exploited WWII for its own financial gain. As Churchill once said: "The United States can always be relied upon to do the right thing — having first exhausted all possible alternatives."
You incorrect about "Under God" being added to the pledge because of Hitler. It was added officially in 1954. for additional information please see - http://en.wikipedia....e_of_Allegiance
The US went into very deep debt as as result of WWII, over $200 billion and 112% of GDP. The UK paid off their WWII debt to the US and Canada in 2006. We didn't bail you out, but we certainly helped in the war effort.
The quote by Churchill is also incorrect - http://quoteinvestig...t-alternatives/
As for the rest of your response it is off-topic and your typical anti-US propaganda.