malaysia agreement 1963 regards as equal partners so the federal govt only have power over foreign policy in return for control of resources. if people move from the west that would be colonialism by the majority malay muslims on the mainly animist or christian dayak population of borneo so movement is limited. borneo gets toll free highways, giant hydro dams, naval bases, tertiary education slots and more despite the much smaller population. state enterprise and civil service move their workforce to build stuff but they are not even allowed to buy a house without marrying with locals.
Malaysia