What kind of agricultural system did the olmec use?

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 anti-semitic policies enforced by the nazi party

Pl asap what explorer first discovered a water route from europe to india? a. john cabot b. vasco da gama c. bartholomew diaz d. ferdinand magellan