When world war i began in august 1914, many people anticipated that the war would end by christmas of that year. which event extended the war into 1915 and beyond?

The French stopped the German advance in the west.

Explanation:

The Western Front was the main theatre of war during the First World War. This describes the German invasions into Luxembourg and Belgium, and eventually France. After the French stopped the German advance in the West, the war became much longer and difficult to win. The Western Front also experienced a stalemate due to trench warfare.

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