If you are referring to pre-WWII sentiment, the turning point was the realization that Hitler was using Charlie Chaplin's mustache for evil rather than for good, and perverting the public opinion of mustaches in general. In a patriarchal society such as ours, facial hair is just that important.
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public opinion
How did the central powers and allies try to influence American public opinion
The release of the Pentagon Papers turned an already war-weary American public even more sharply against US involvement in Vietnam. As of June 2011, the Pentagon Papers are declassified and available to the American public in their entirety.
That question is a matter of opinion.
This is an opinion question. Personally, I think the Dawes Plan was a very good idea. By bailing Germany out of its hyperinflation, the US gained a German market for American goods to get America's economy back in full gear.