I think the 3rd answer is correct
A 2019 paper from Tel Aviv University identified economic competition, cultural competition, racial attitudes, and fear of crime as some of the most significant factors in opposition to immigration.
One could be the rise of towns and the crusades. The Crusades was a campaign to reclaim the
Holy from Muslim rule. Despite the
number of campaigns launched. The Holy
remained under Muslim control and this weakened the feudal system as the
nobility spent most of their wealth on these campaigns. This led to the growth of towns where merchants
grew rich and became a force in society which led to the rise of the
Renaissance where interest was centered on the classics.
