What business practice contributed most to Andrew carnegies ability to form a monopoly

What are some differences between mccarthy’s “west virginia speech” and his “letter to president truman”? what are some similarities?

Reformers worked to change schools by making them more:

In ohio in 1872, the cleveland massacre was a)a violent labor dispute at standard oil refineries in cleveland. b)a takeover by standard oil of the refineries in cleveland. c)an attempt to stop standard oil from becoming a monopoly. d)a failed attempt by standard oil to take over other refineries.