What were liberty bonds in WWII???

Liberty Bonds were federally issued debt obligations used to finance American participation in World War I. Liberty Bonds, which appealed to patriotic sentiment, offered many "ordinary" Americans their first experience with investments.

du boi was considered a radical because he wanted the immediate end for segregation. the biggest different between him and booker t. washington is that, even though washington believed that segregation should be considered illegal, he did not believe at all that a law was needed to keep blacks away from whites and that this would be something natural (to have the races apart) for a long time until society adjusted, while du boi believe that agitation was the only way to end segregation.