What is one way german culture has been changed or affected by cultural diffusion?

Demography. In accordance with modern European patterns of demographic development, Germany's population rose from about 25 million in 1815 to over 60 million in 1914, despite heavy emigration

your answer is 1930's

explanation

this is just around the time the great depression was starting and putting the us ecnomy into ecnomic failure causing the goverment to take a much larger rule to try and pieace it back together