Approximately how many americans, from both the north and the south, were killed in battle during the civil war?

What were four reasons for the decline of spain as a world power

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.

Brainliesttt asap!me : describe the responses to terrorism in the united states.