What was the u. s. policy once world war 1 begin in europe

To stay out of foreign affairs unless they directly affected the U.S itself.

Hope this helps!

not sure might be he acquired the entire oregon territory from great britain

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.