Respuesta :
Answer:
Russia mobilizes its forces on Germany's eastern borders.
Explanation:
The immediate effect of the Germany to declare war on the Allies was Russia mobilizes its forces on Germany’s eastern borders. Thus option 2nd is correct.
Who were the Allied Powers?
Allies were the association of the countries who came together to fight against the Central powers. The countries who were the allies are Great Britain, The United States, China, and the Soviet Union.
The immediate cause of the event that made Germany to declare war on the Allies was Russia mobilizing its forces on Germany's eastern borders.
In response to the Austrian assault on Serbia, Russia starts to fully mobilize its forces. Germany declared war on Russia, France, and Belgium, and its military immediately began to fully mobilize.
Learn more about Allied powers here:
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