Why did christopher columbus feel that he had failed to accomplish his goals by the time he died?

What do the discoveries of shells used in jewelry and a huge dredged canal tell us about the indus valley civilization?

Explain the reasons for u.s. neutrality during the 1920s and 1930s. how did ideas about neutrality change during the period from the end of world war i to the passage of the lend-lease act? be sure to include any events, terms, or people that may support your response.

Which best describes the albany plan of union? it was a failed plan to eliminate the colonists’ right to vote.it was a failed plan to unite the american colonies.it was a failed plan to make the colonies independent from britain.it was a failed plan to strengthen individual colonial governments.?