As trade grew between small city Trenton and large city Glendale, the seaport had to be expanded. (Trenton pop; 1,003 at the time- Glendale pop 60,783. I can't do a cj for Glendale because it is too developed). But anyway the industrial pop was 0 in Trenton, but 11,000 in Glendale, so Trenton needed supplies.