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

Ineed on 2-4 i want y’all to reply to this question so i can turn this into my teacher tomorrow

Two of these describe "federalism." (choose two answers) select one or more: a. the national government absolutely controls all state governments. b. power is shared by the national and state governments. c. state governments exercise absolute power over the national government. d. it is a compromise meant to eliminate the disadvantages of a "unitary" and a "confederate" system.

How many countries have signed the kyoto protocol?