Germany's increase in industrial production in the late-20th century had what unintended result?

a) the end of communism

b) imperialism in africa

c) emigration to the u. s.

d) environmental pollution

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.

not sure might be he acquired the entire oregon territory from great britain