the walls would also be plated with iron, and spiky iron shards to stop anyone from climbing over it
to help ensue safety send soldiers to patrol each city 5 for each city, 8 for each misc city, and 20 for each large city. Use the bombs to blow up the vacant illegal cities/settlements in the military province also build a wall guarded by 200 soldiers
recombine the provinces to just 5 and hire high ranking people as judges to testify if a crime is true or false with evidence of course and scare off the people who had settled in the military province, illegally, and also charge them a fine, the fine would be 10 % of all their wealth, also build a jail near the military province, where we will sentence people to 5 years of jail time if they got caught settling in the military province,
R4WLYX: People are starting to illegally settle in the military province. Your advisors note that your current model of specialised states and provinces is becoming increasingly untenable in a colonial empire.
R4WLYX: Furnaces are being developedthat can fully melt iron, allowing it to be casted into shape.
By "the modern era" I mean whenever the resource becomes relevant.