On the western front the major military strategy that lead to four long years of war was?

Explanation:

Which war? Europe abounded with them. It sounds like you are talking about WWI.

In World War I the major method of fighting for both sides was trench warfare. Essentially that was like a mole burrowing in an underground tunnel whose top, for the most part, was open.

Planes and tanks and ships to some extent were used, but the main battles were on the ground in trenches.

If I have picked the wrong war, could you please leave a note telling me which war you are talking about.

they wanted the u.s. to fight on the side of the central powers.