What was one of the effects of the crusades on european society? the conversion of parts of southern and eastern europe to islam the importation of the black death the architectural method of building stone fortifications the temporary unification of catholic and orthodox branches of christianity all of the above?

c. the architectural method of building stone fortifications

d. the temporary unification of catholic and orthodox branches of Christianity

Explanation:

The main effect of crusader on the European society is the building of forts with big stones in order to defend and safe the cities from the attack of the enemies. The other effect of the crusades on European society is the joining of the armies of catholic and orthodox which are the branches of Christianity against the Muslims. This union of catholic and orthodox is temporary and ends when the war is over.

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john maynrd keynes developed new economic respose to the                           ( b. great depression if the 1930's)