Answer:
In his book, Aryabhata, he suggested that the Earth was sphere, containing a circumference of 24,835 miles (39,967 km). Aryabhata also mentioned that reflected sunlight is the cause behind the shining of the Moon.
They were looking for the "Northwest Passage" to the sea. Or basically seeing where America ended in the northwest side of the country.
Hope this helps :)
Death would make the most sense
The Yokuts, Chilula, and Cupeño are three
Disease was the reason for the death of native Americans
