The correct answer to this open question is the following.
The fall of the Berlin wall might have impacted the relationship between the Soviet Union and the United States in that this event represented the culmination of tense and conflictive relationships during the Cold War years in which both nations competed in the arms race, meanwhile the Soviet Union tried to spread Communism in many places and the United States tried to stop it through the foreign policy of containment. USSR leader Mikail Gorbachev and his policies of Perestroika and Glasnost really helped to facilitate this process.
The feudal system was just like an ecosystem - without one level, the entire system would fall apart. The hierarchies were formed up of 4 main parts: Monarchs, Lords/Ladies (Nobles), Knights, and Peasants/Serfs. Each of the levels depended on each other on their everyday lives.
Many poor Europeans were drawn to the colonies in the americas because they believed they could raise their social status in the colonies
Smallpox, the world health organization came up with a vaccine and had everyone vaccinated
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Japan intended the attack as a preventive action to keep the United States Pacific Fleet from interfering with its planned military actions in Southeast Asia against overseas territories of the United Kingdom, the Netherlands, and the United States.
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