Final answer:
The land is still "Unorganized Territory" because the land sales did not generate enough revenue to address the economic problems of the country, leading to a lack of organized development and governance in the territory.
Step-by-step explanation:
The reason the land is still "Unorganized Territory" even though the United States purchased it over 15 years ago is because of the process of organizing new states and territories. In the case of the Northwest Territory, which was acquired from Britain at the end of the Revolutionary War, legislation like the Land Ordinance of 1787 and the Land Law of 1796 set guidelines for selling and dividing the land into townships and sections. However, the land sales did not generate enough revenue to address the economic problems of the country, leading to a lack of organized development and governance in the territory.