What enabled Europeans to protect themselves from becoming infected with malaria?

Why was the bill of rights so important to new york and virginia

What was the most important consequence of the large-scale ecological changes in africa two hundred thousand years ago?

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.