Qué nuevos grupos sociales urbanos surgieron desde el siglo XV en Europa

What is the difference between an independent and a dependent variable?

In ohio in 1872, the cleveland massacre was a violent labor dispute at standard oil refineries in cleveland. a takeover by standard oil of the refineries in cleveland. an attempt to stop standard oil from becoming a monopoly. a failed attempt by standard oil to take over other refineries.

How does the balance of trade look different in the us today vs hot it looked in the 70's