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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The most significant contribution of the World Vision International organization is it's efforts to reduce poverty all over the world. As one of the largest charity organizations in the world, World Vision International generates over a billion dollars of revenue per year.
After world war 2 Quebec did become the most culturally diverse cities in the world. This city has over came many different things.
that it would be over very quickly
Most definitely. Without a large-scale Allied re-invasion of Western Europe, it can be imagined that WWII might have lasted over a year longer.