Because the Incas were very behind in their warfare and military tactics, as well as lack of weapons. Their spears,slings and clubs could were no match against bullets, crossbows, swords and steel armor.
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Communism in Russia. In Russia, efforts to build communism began after Tsar Nicholas II lost his power during the February Revolution, and ended with the dissolution of the USSR in 1991.
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Social change can cause conflict within and between societies. Social change can cause a cultural lag which leades to conflict. A main conflict is between youth and parent, which is a result of social change.
During the 20th century there was war. This includes World War I. The wars would cause poverty in familes due to the high demand of food and supplies to soldiers overseas. This led to other families fighting for survival.