What factor does jared diamond propose to explain this isolation of various groups within the americas? explain

The formation of business monopolies in the late 1800s was made possible by the (1) effects of laissez-faire policies (2) passage of federal antitrust laws (3) elimination of the free-enterprise system (4) adoption of socialist economic practices

How did margaret thatcher de-escalate the cold war

Was the civil war inevitable? could anything have been done through compromise to stop it, or did it have to happen?