If others probably preceded him to America why is Columbus given so much credit?

Select one:
a. Columbus inspired others to follow and to invest in trips of exploration and conquest
b. Columbus established meaningful diplomatic relationships with native leaders
c. Unlike others before him Columbus knew that he had discovered a new Continent

1 answer

Enslaving natives is not generally thought to be diplomatic. (not b)
Columbus thought he was in Asia. (not c) Without a good clock it is hard to tell your longitude, even if you know the circumference of the earth.