Explain three reasons why europeans joined the crusades

Crusades refer to battle which are fought by the Muslims and Christians over the Holy Land.

The Crusades involves series of military conflicts conducted by Christian knights to defend Christians and its empire against the Muslim forces.

The 3 reasons why the Europeans joined the crusades includes:

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although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.