From the 9th century onward, the swahili were best known for their: a superior military technology b strong ties to the muslim world c devotion to the spread of christianity d large west african empire

The answer is b

answer; taking up arms to defend the nation;

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.