The country and style of filmmaking that greatly influenced the German Film industry before World War 1 was France/modernism.
There were several nations that had a profound influence on Germany's filmmaking before World War I began but one notable nation was France.
The French had pioneered the modernism genre of movies during that time and even though these movies were silent films, they were still hugely popular in Europe and Germany.
As a result, the Germans took influences from French movies to make their own which became hugely popular as well until the First World War broke out.
In conclusion, the country that influenced German filmmaking was France.
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