It is important to consult a variety of sources when conducting historical research due to the historians usually don't have the same point of view of the facts in the history, or dates, and other stuffs that the researcher must clarify.
Regularly, the people say the history can't be changed, but, the historians are making this all the time, some historians think about a date or a fact with a point of view and other think different, by this reason is so important to consult a variety of sources.
For example, some historians says the Zapotecs (Mexico) began as a community in 15th century BC, but other says that date is excessive and they come just from 5th BC at the same time other civilizations in the region.
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