The telephone and the light bulb
Dont lend out money!!!!!!
History, for one. Communism is mostly attributed to Karl Marx, whom believed that workers are abused by the upper class. Communism is mainly the belief that one "takes as he needs" rather than own more than what is needed. This idea has failed in practice as Joseph Stalin abused the system.
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The reason why it was built was because, architecture was straightforward.It hads a strong foundation, and it also had support. And mostly the reason built huge stone structures high in the Andes. Was mainly because they believed in multiple gods/goddess, so i think that's why ( to worship the gods). and i also think the Inca live because in the Andes Mountains because the rich soil and the escape from other tribe
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