Answer: The collapse of the Berlin Wall.
Explanation: The collapse of the Berlin Wall as the culminating point of the revolutionary changes sweeping East Central Europe in 1989. Throughout the Soviet bloc, reformers assumed power and ended over 40 years of dictatorial communist rule. The reform movement that ended communism in East Central Europe began in Poland.
When Caliph Umar conquered Jerusalem for Islam, he chose the Temple Mount as a place for Muslim worship. Today, the Haram Al-Sharif includes major sites of worship for Muslims, such as the Dome of the Rock and the Al Aqsa Mosque. Muslims hold the Temple Mount sacred as the site where Mohammed ascended to heaven.
I think the answer is D, He organized the Louisiana Purchase
