<u>Mesopotamia</u> was ruled by kings. The kings <em><u>only ruled</u></em> a single city though, rather than the entire civilization. For example, the city of Babylon was ruled by King Hammurabi. Each king and city designed the rules and systems that they thought would be most beneficial for their people.
James J. McAlester contributed to the economic development in Indian Territory by making many lucrative coal claims and later on establishing McAlester Coal Mining Co.
The elemental classification for oxygen would be non-metal. It is located in period number 2 and group number 16. It has an atomic number of 8. At room temperature, it exists as a gas. Hope this answers the question. Have a nice day.
