What is referred to by 'columbus philadelphia hartford'?

Based on the clue 'columbus named this flagship on his 2nd voyage aft...', what is the answer? What is associated with: columbus native buster douglas was a 1990s champion in this sport dubbed the sweet science? Based on the clue 'columbus ohios main drag is called this more often...', what is the answer? Based on the clue 'columbus personal flag bore the initials f y whic...', what is the answer? Based on the clue 'columbus reaches south america for the first time', what is the answer? Based on the clue 'columbus said goodbye for good in this year 14 yea...', what is the answer? Based on the clue 'columbus ship whose name is spanish for little gir...', what is the answer? What is associated with: columbus sighted this volcanic island in 1493 gave it a name meaning saw toothed mountain?