How did european colonial powers attempt to make africans dependent on imported goods?

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.

What type of monarch was fredrick the great ?

What does it mean to say the united states has a federal system of government