Answer:
The domino effect.
Explanation:
The Domino effect is the theory that when one country falls to communism then more will soon follow, one by one. This is what got us into the Cold War and all conflicts surrounding it, including the Korean and Vietnam War.
As the historian walked into the old cave , he took notice of the Paleolithic cave paintings depicting people and stones !!
Definately <em><u>B. The Automobile</u></em>
B) Nationalism sparked political revolution that promoted liberal government (apex)
