In 1920 there were significantly fewer immigrants coming from Germany than just ten years earlier. What happened between 1910 and 1920 that might have decreased Germans’ willingness to move to the United States?

Explanation:

One thing that may have led to less German immigrants into the united sates may have been a mutual disliking. Parts of Nazi Germany were starting to grow already and many "free" countries like America disagreed with that, even though the war wasn't going to begin till 1939. It seemed the Germans had contradicting views to many of the current Americas. Another reason may be the German power of the Era. It is important to note that Germany was very successful and held major control.

the three answers (for plato at least) are:

b-condemned sola fida 

d-set rules for establishing seminaries and for educating clerics in the seminaries 

f-recommended moderation in the sale of indulgences and banned the sale of false indulgences