Answer: O Social and political activism in the U.S. Conservation efforts began
Explanation:
Columbus managed to convince "The Enterprise of the Indies" to (put what he convinced them to do here), but not King John ll of Portugal. You can also switch the order for that sentence (Columbus wasn't able to convince King John ll of Portugal, but he was successful with "The Enterprise of the Indies"). (enter name here)'s wife Felipa dies (either enter cause of death or why it relates to the previous sentence here). Hope this helps
The gradual decline of the Roman Empire ushered in an era of European history called the Middle Ages, or the medieval period
