Question

who encouraged improvement in marine technology and the exploration of new trade routes during the 15th century

Answer 1

Conquistador refers to the Spanish soldiers, explorers, and adventurers who brought much of the Americas under the control of Spain in the 15th through the 19th centuries following Europe's discovery of the New World by Christopher Columbus in 1492.

Answer 2

I think you should focus on Portugal also because, prior to the discovery of America, Portuguese economy was far better than the Spain's.