Answer:
The theory was that Polynesia “lay within the range of pre-European mariners from South America.” Now go and get that A+ :)
He believed that they were soldiers of democracy because they fought in a war to protect a world that disenfranchised them and segregated them and ended the reconstruction and what not. He believed that the country was being heavily racist towards African-Americans and yet the soldiers still put their values above this and fought to protect a democracy that didn't protect them.