Presidential. (For the United States)
The Catholic Church was challenged on its teachings regarding penance (repentance of sin), indulgences (removal of guilt), and the authority of the pope. This led to the beginning of the Protestant Reformation when Martin Luther posted which of these documents on the doors of Castle Church in defiance of Rome? the 95 Theses on the Papacy in Rome work on the Psalms sermon on Good Works
Florence was the most famous. :)
Economic failures and years of warfare, the Chernobyl disaster, perestroika glasnost and Mikhail Gorbachev all of these factors contributed to the collapse of the Soviet Union or USSR in the year 1991. Some of these incidents had a direct impact on the breaking of USSR into several countries, while others had a direct role.
John Tyler he was the 10th president
