How could the Berlin Wall have led to war?

There was a close encounter at a Berlin wall Check Point where many tanks pointed their guns at each-other and luckily Stalin and the President of the US   made a quick call telling the other to back bit by bit

      If even one tank shot there cannon, WORLD WAR THREE WOULD OF STARED!...

he official purpose of this Berlin Wall was to keep Western “fascists” from entering East Germany and undermining the socialist state, but it primarily served the objective of stemming mass defections from East to West.

To this day, the Berlin Wall remains one of the most powerful and enduring symbols of the Cold War.

Modernization turned Japan into a major world power. They were able to rapidly industrialize and build a powerful military. This allowed them to acquire an empire in East Asia, and even defeat Russia during the Russo-Japanese War from 1904-1905.