What events caused the decline of the Abbasid dynasty? A. The Abbasids willingly gave up their lands to the Seljuk Turks and the Mongols.
B. The Abbasid empire fragmented, and other peoples gained control.
The invaders from Spain created small kingdoms throughout the former empire.
D. The Umayyads and the Abbasids waged a civil war that destroyed the empire.

The correct Answer is A)  Stalin believed that security for the Soviet Union meant less security for others

Explanation:

John Lewis Gaddis is a renowned  Pulitzer Prize winning professor at Yale University teaching military and Navel history.

He believed that the Soviet Union's whole strategy was dependent on one person and what that person wanted alone. Unlike the United States with a representative Congress and military officers, the Soviet was a dictatorship and it was Stalin's belief that to secure Soviet Union's security, there needs to be trouble abroad.

That is why he further stated that the Cold War as started because of Stalin and if there was anyone else in power, other than him, things might have been different.