To what extent should the period between 1900 and 1913 be known as the Progressive Era?

answer: in october 1962, an american u-2 spy plane secretly photographed nuclear missile sites being built by the soviet union on the island of cuba. president kennedy did not want the soviet union and cuba to know that he had discovered the missiles. he met in secret with his advisors for several days to discuss the problem.

explanation:

c or d both can be the answer

because the vietnam war was fought in an especially brutal and untraditional way

independent innovation during the abbasid caliphate