Some historians believe that up to what percentage of new word population was killed

90%

When the Europeans arrived, carrying germs which thrived in dense, semi-urban populations, the indigenous people of the Americas were effectively doomed. They had never experienced smallpox, measles or flu before, and the viruses tore through the continent, killing an estimated 90% of Native Americans.

Explanation:

europe churches founded monasteries and universities that studied philosophy and nature.

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c) legal battles last five weeks after the election due to the narrow victory in several states.