Since the medieval Christian focus was on salvation for a glorious afterlife, interest in realistically representing objects of the world disappeared.

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.

i believe the answer is d.

north atlantic treaty organization.

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.