What group of people served as the "study base" of the frontier

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.

How did radicals such as robespierre justify the use of terrors

What role did william wilberforce play in the abolition of slavery in the british empire?