Quote Originally Posted by Kaiser of Arabia
World War One was indecisive mainly due to the following reasons:
1. The strategies used by generals echoed the strategies used in the Napoleonic wars
2. In trench warefare, there is no decisive victory. Almost no assault is sucessful.
3. THE COMMANDERS WERE IDIOTS! I mean, read up on the Somme. Yeah.

And the allies won because:
1. Industrial support by the United States
2. They outnumbered the Austro-German-Turk-Bulgarians.
3. In 1917, both sides were tired. However, a fresh influx of American soldiers with new supplies gave the allies an obvious edge over the tired and battered Germans.
yup that's right. the germans were actually winning till the americans came in. and the generals were idiots indeed, best example is the somme