He would claim that it was proof of superiority. Social Darwinism is an idea that people or countries who succeed in life and who become rich did so because they could adapt to the environment and that those who are poor are inferior to them because they couldn't. In country leading, the idea is that the countries that became wealthy were superior and thus easily became rich while poor countries are inferior in their opinions.
The United States policy during the early years of World War II is to remain neutral relationship in regards to war while making and providing war supplies to the Great Britain. Providing war supplies to the Great Britain means that the they have to pay back the United States.
