Answer:
In early Mayan studies, archeologists assumed that women were subordinate to men in Mayan society. Men were kings and rulers of the city-state, and men were rulers in their homes. Recent studies haven't changed that notion, but new research shows that women were more central to Mayan society than previously believed
Trade was the motivating factor. The silk road accross Asia was besieged by bandits & required bribes to a number of nations to transport goods to & from Asia. Therefore a sea route would be a much safer & less expensive means of getting trade goods to & from Asia.
Harry Truman made the decision
President James Polk made the Gadsden Purchase in 1853 to expand the size of the U.S. during Manifest Destiny.
Relative chronology- locating related events relative to each other. Absolute chronology- locating specific dates in a chronological era.