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?

I think the event that extended the war was when Russia declared war on Austria-Hungary as a sign of friendship to Serbia. Germany then declares war on Russia as a sign of friendship to Austria-Hungary. France as a sign of friendship then declares war on Germany. Britain as a sign of friendship declares war on Germany when they invaded their ally, Belgium.

Explanation:

the virginia plan called for three branches of government and two houses of congress. representation in each house would be determined by population. the new jersey plan called for three branches of government and a single house of congress. each state would have an equal vote.