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I discovered this question in our database. It is fairly old now but I need to let you know why no one was able to answer your question. It lack the information on what was "these things". We needed to know what the choices were to answer your question.

I can give you a guess: I would say it would be the War Bond Drive taught the US what was effective in advertising. They used hundreds of posters then and since then we have had millions of billboards put up around the USA.

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14y ago

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billboards

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11y ago
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Q: What had the most influence over advertising after World War 2?
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