Why were europeans able to explore the new world in the 15th and 16th centuries?

What would lead a historian to consider two events to have a relationship of correlation rather than causation?

What was an immediate result for japan after world war i?       a.  a boosted economy      b.  a slower economy      c.  a weakened military      d.  less territory controlled by japan

At the casablanca conference, allied leaders signed an agreement to share military technology decided to launch an invasion of southern france agreed to accept only the unconditional surrender of the axis powers agreed to form a scientific team to create the atomic bomb