There were many reasons why the Harlem Renaissance held such significance in US history despite its fading influence during the Great Depression, but the main reasons is because it introduced whites to black culture.
The main thing that allowed Russia the ability to fight for so long was it's size. Invading armies would quickly grow tired and many would die in the harsh Russian winters.
1) land/home was not something that could be sold<span>2) They thought US would not keep promises</span>