In the 1920s, how did the cubist movement reflect the influence of world war i?

I believe that the answer to the question provided above is may of the artworks in 1920 which uses cubism are usually in relation with the WW1. 
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The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .

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