There were various effects of the Crusades on Europe and Asia:-

i) The Muslim states began to adopt a harsher attitude towards their Christian subjects.

ii) There was a great increase in the influence of Italian mercantile communities in the trade between the east and the west.

iii) Power of Europeans feudal lords decrease and there was a decline of feudalism in Europe. It helped in the emergence and rise of the Nation-States.

iv) the crusade left a deep impact on Christian-Muslim relation in a negative way.