The split into Sunni and Shia divisions of Islam can be traced to

World war 1

Explanation:

This led with syria being released from the ottomans split the territory into shia and sunni. It wasn't too bad until france released it and it became its own country, where ISIS emerged.

in an effort to stem the tide of refugees attempting to leave east berlin, the communist government of east germany begins building the berlin wall to divide east and west berlin. construction of the wall caused a short-term crisis in u.s.-soviet bloc relations, and the wall itself came to symbolize the cold war.

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