Why did the Schlieffen Plan result in a stalemate?
The Schlieffen Plan resulted in a stalemate because the German high command did not sufficiently commit to that plan. The plan called for a very token force to be left to defend Germany against a possible French attack in the south. In the mean time, the "right wing" (from the German perspective) of the attack was to be made as strong as possible. This wing would come around from the north and crush the French. But the German high command did not do this. They made the left wing (the one defending Germany) too strong and the right wing relatively weak. Therefore, the right wing was not able to completely crush the French and stalemate set in.