What effect did the crusades have on trade in western europe? trade throughout the mediterranean was destroyed. trading cities became more important. italian merchants saw their fortunes ruined. europeans began to sell their own spices.

Europeans  began  to   sell  their  own  spices  was the  effect  of  crusades  on  trade  in  Western Europe. European  developed to  a taste  for  some goods. The  vessels  which  were  used  to  bring crusader  to  the  holy  land was  used  for  trading  purposes  where they  were  used  to  transport  goods.

What war are you specifically talking about?