We pay for it with our sales dollars. If not for the people outside of Wilmington, the city would be an economic disaster. Also, the people from the county pay for the library as well as many other buildings and government services that are located in the city limits. If the county residents must pay tolls to get into the city, then they should move all of the county's services to outside the city limits, including the courthouse. That will provide less traffic on the streets in the city and less traffic into the businesses within the city limits.
Regardless of what you think of North Carolina's way of enacting this law, forced annexation has always been unconstitutional. The people being annexed have no say so in it therefore they have been subject to taxation without representation which is unconstitutional.
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