Who ruled before batu khan? (started the russian invasion)

What was charles townshends development of a crop rotation system important to the industrial revelotion

How was the declaration of the rights of man similar to and different from the declaration of independence

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.