Hillaire Belloch points out that one of the biggest mistakes of the crusaders was the failure to conquer Damascus. However, even a greater mistake was that not enough Europeans immigrated to the Holy Land.
1175 there were about 500 000 people in the Holy Land. About half of them were Christians. And about half of them, i.e. 100 000 were from Europe. That was not enough especially because of intermarriage.
Holy Land was ultimately lost because of the intermarriage between the Europeans and the locals.
In the modern era of Political Correctness, one can no longer speak of race, ethnicity, kinship, or “blood” unless one is disparaging Occidental people or their ancestors while at the same time trumpeting the virtues of the assorted brown and colored peoples of the globe. Not so with Belloc, who was far from alone among historians of his generation who understood the significance of race and blood in the episodes of the human past and how important these factors were in the creation of societies and civilizations.
To scholars like Belloc, race and religion did matter, and in his view it was a significant reason why the Crusades ultimately failed to hold their possessions. Of course, there were other factors that Belloc duly notes – the failure to control the strategically vital city of Damascus; the lack of reinforcements both in arms and people from the West; the refusal of Byzantium to ally with the Crusaders; the lack of a strong monarchy in the Latin states. Race, however, in this instance, the mixture of French blood with the local population, was critical in the eventual defeat. The “mixing of blood” between the Franks and the Near East population especially among the leadership proved fatal. Few, if any academics of today could write such things.
The miscegenation among the nobility and the subsequent generations in the newly formed Latin jurisdictions proved to be “inferior” in talent, ability, and leadership to build the type of society necessary for the Crusaders’ initial victories to be turned into a permanent civilization.