When Serbia refused, Austro-Hungary declared war on Serbia, forcing the mobilization of Russia to prevent the destruction of Serbia.

German forces mobilized in support of Austro-Hungary by prior agreement, and declared war on Russia in response to her mobilization of forces.

To avoid a war on two fronts, Germany attacked France because of the fear that France would attack Germany once Germany and Russia went to war against each other.

Britain entered the war against Germany because Germany invaded Belgium to bypass the most fortified approaches into France. By 1917, German attacks on neutral shipping bound for England provoked the U.S. To enter the war as well. Some of the first action of the wider war was the occupation of German colonies in Asia and Africa. By the end of the war, England was poised to rule much of the Middle East until after World War II, which control was...
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