Can washington's "warning from a parting friend" be useful today

What would lead a historian to consider two events to have a relationship of correlation rather than causation?

Read the excerpt from the history of herodotus, book 2. egypt . . is an acquired country, the gift of the river. this quotation from herodotus, a greek who traveled in egypt, is about how the nile river enabled ancient egyptian civilization to develop and succeed. what specifically was the river’s gift? fertile soil fishing stocks defensive capabilities drinking water

According to the map, most mining occurs in the a.northern b.southern c.eastern d.western