The United States became involved in Vietnam
because Americans feared that

Because of communism...

Explanation:

After the assassination of President Kennedy in 1963, Lyndon Johnson became the new President of the USA. He referred to the domino theory, by which he meant that if Vietnam became a communist country, other countries in South Asia might follow its example, much like one domino sets off another until they have all fallen down. Johnson decided to send American soldiers to the war in Vietnam to prevent this from happening.

in november 1781, john hanson became the first president of the united states in congress assembled, under the articles of confederation. many people have argued that john hanson, and not george washington, was the first president of the united states, but this is not quite true.

explanation:

1. darius the great     persia  

2. piankhi       nubia

3. ezana       aksum

4.     nebuchadnezzar     babylonia

5. shalmaneser iii     assyria