Columbus explored all of the following except:
south america
north america
caribbean islands
central america

B. North America.

Explanation:

Christopher Columbus actually never explored North America. The first person to explore North America goes to John Cabot, although there are numerous studies on how vikings were actually the first ones to explore North America. John Cabot, also known as Giovanni Caboto, went exploring when he got sent by Henry VII, and found North America in 1497.

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes

answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast