Re: Pashtuns are plotting to take over Karachi, Kamal tells NPR
thats bull.
federations (US is a good example, EU is another, India is another) dont constrain the movement of citizens across provinces.
migrants dont just use the infrastructure (what infrastructure!).. they are usually people who find some sort of work and are therefore good for the economy. Its not as if the state is providing these people with 2 bedroom apartments that you talk about one province recieving compensation from another.