Answer:
Option: D escalation of the Cold War
Explanation:
The Brinkmanship policy of the 1950s resulted in a conflict escalation of the Cold War. The Brinkmanship was a foreign policy between the United States and the Soviet Union. The best example of this policy referred to the Cuban missile crisis when the Soviet place nuclear missiles in Cuba in 1962. The policy forces communication between two parties confrontation to gain an advantageous agreement over the other for power.
The Ohio River, as the dividing line between<span> slave states, </span>south,<span> and free-soil states, </span>north.
