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The meaning throughout all of these posters is to join the war by enlisting in the army. I think the overall theme is don't be selfish, I think that's the theme because in most of the posters the word you is emphasized.

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Propaganda is used to promote a particular political case. Propaganda is a tool that mostly the government uses. In World War 1 the Government uses it to get many things such as more food, troops, weapons. Their goal is to be able to keep supplying food for troops,and for more people to enlist.