The media coverage during the Vietnam War gained popularity since more than half of the Americans have television. It became more engaging to see news in front of the audience's eyes than to read the newspapers. The evening news was more of the war than any other tv shows.
The negative effect of it was more people were ready to accept the news presented to them and loose understanding of the facts on their own.
As far as I know only the Chavin civilization (Chavin de Huantar in today's Peru) also constructed pyramids. Their pyramids were flat on top - likelt so that ceremonies can be performed there.
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