He 1)explain three rreasons why columbus made his voyages to the new world? ? 2) describe three achievements of the maya in science and 3) explain four causes of the decline of the taino population by 1560? ? 4)name four european ports which were involved in the trade in captive africans in 1700s? ?

1.Gold,Spread christianity,Faster trade route to Asia
2.Astronomy,The calender,Number system
3.physical fatigue, island illnesses, such as German misles and chicken-pox,massacres perpetrated by the Spanish, systematically committed suicide and mass abortions.
4.Spain and Portugal, England and France, the Netherlands and Denmark

Iwould say a, due to the fact these routes display many things that would be useful and provide explanations for how states are known.