How did congress attempt to maintain a balance of power between northern
by keeping the number of free and slave states equal
by creating more free states than slave states
by created more slave states than free states
by forming new polítical parties to address slavery

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.