Some experts say that Demonstrations have little or no lasting impact (William R. Berkowitz).
Usually public support decreases as a war wages on. Ten years after the start of the Vietnam War (this was in 1959) half a million people participated in an anti war demonstration (1969) in Washington.
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In 2007 tens of thousands protested against the Iraq war in Washington.-o-o-o-
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The Peace Moratorium is believed to have been the largest demonstration in US history with an estimated two million people involved.
