Truman, Eisenhower, Kennedy, and Johnson involved the United States in a war in Vietnam to support "containment"--specifically containment of the communist influence that was spreading in the area due to Soviet expansion.
I’m not 100% sure but I think it’s spot
Strategic location was a major reason why Constantine moved his capital to Byzantium. <span>It was easy to defend, it was surrounded by three sides of water. They had walls to protect from sea intruders and invasions and They stood as crossroads of Europe and Asia, and linked many trade routes from the west to the east. This aloud a major trading population, and made the city and some of its people very wealthy.</span>
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The invention of paper greatly helped the spread of literature and literacy, making books more convenient to use and cheaper. Scholars at the Imperial academies were issued with thousands of sheets of paper each month by the government.
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