Why did cities such as venice flourish as a result of the crusades?

Venice flourished as a result of the Crusaders because, people flew into Venice and which increased its power as a city-state . Crusaders depended on those cities for supplies. The Crusades also led to an increase in trade between the Middle East and Europe and contributed to Venice’s dominance  of the Mediterranean during the Crusades.

b: the establishment clause  

b: socialism  

"the attempts of the proletariat to rise above this abasement"