At 1950s it was different then today today we have many things at 1950s they didn't have many things they didn't have cars things were different then today today it's change it's not 1950s
Roman authorities treated conquered people in a very just way. Once the conquered decided to accept their conquerors and started paying taxes and supplying soldiers, the Romans allowed them to maintain their beliefs, their local governments and their customs, giving them partial citenzenship and thus making them able to marry Romans and carry trade.
So that the English could win back the Holy land.
To return Jerusalem and the Holy Land to Christian control. The crusades failed because they were not able to retrieve the Holy Land.