PLEASE I NEED HELP AND IT NEEDS TO BE 4 PARAGRAPHS

why did world war I last so long?

Hmm, I kinda can’t help with 4 paragraphs BUT I did look this up “A land stalemate: contrary to the expectations of several parties, the war just couldn’t be finished with a one-two punch combination: for the Germans, it was Paris, then Russia. The Entente, in particular the French, had their own one-two punch combination (Plan XVII) that was a catastrophic failure. All sides kept on fighting, forcing each other into a static war all sides knew it would be very difficult to win (therefore, their respective one-two punch strategy).
A strategic stalemate: the German invasion of Belgium meant that the equilibrium of power would be broken until this country would be restored to its position as a buffer, and with Germany unwilling to cede control of Belgium (for its own strategic reasons[1]) meant that the Entente just could not cut a deal with the Central Empires. This meant…
…a diplomatic stalemate: without the will to compromise, the situation kept going as long as the combatants were willing to fight to keep their strategic goals, rejecting several attempts to reach a ‘peace without victors of losers’, as Pope Benedict XV proposed to the combatants in August 1917.
Finally, there was the domestic situation: all powers had invested a lot of efforts to convince the respective populations that only victory would make all these sacrifices worthwhile. The situation was particularly difficult in Germany: unlike the Entente, with far more democratic governments who could always place the decision to end the war on the population’s desires, the far more authoritarian German Empire could only blame its leadership for the failure: not winning the war would mean, not the fall of the government and an election, but the collapse of the entire system and the destruction of the upper level of its political class, by exile or death.[2] Austria-Hungary was in a similar, but even worse situation: not winning the war would be the fall of the Habsburg dynasty, together with the destruction of the Empire as institution.” This is from quora

Try to go online and find the answer