Federalism and the 10th amendment work together--the 10th Amendment states that if something is not covered by the Constitution and there is no specific federal power, then the power goes to the state.
Federalism is the principle that government should be divided between a central power and regional powers. In the case of the 10th Amendment, if the central power doesn't have explicit power to do something then the states have the power to do so.
While there are no options, some of the characteristic is that the economy of the North was based on industries, and currently on technology as well.
The North became an early leader in industrialization because of its fast moving rivers. In addition, its soils and climate was not favorable for agriculture. The settlement of large number of people in the area also served to stimulate commerce.
It sounds like you might have a list to choose from, but there is nothing here. Is there more to the question? :)
Hungary
Bulgaria
Czechoslovakia
