Explain how state and national boundaries follow both natural features and human-made lines

The answer is They are not the same as the city, state, or national limits since they are not set by laws. Actually, districts can be founded on a wide range of qualities. Districts can be founded on major land forms found in a given region. Districts can likewise be founded on what the general population there improve the situation a living or on what dialect is talked there. Not at all like urban communities, states, and countries, most areas are not set apart with signs.  

Explanation:

Three basic sorts of locales are formal districts, which are characterized formally by the administration or different structures, for example, urban areas, states, and mountain ranges; utilitarian areas, which comprise of a focal place and the encompassing regions that are reliant upon that place, for example, a metropolitan region; and vernacular. Area can be total or relative. Supreme area gives a clear reference to find a place. The reference can be scope and longitude, a road address, or even the Township and Range framework.

answer; in the united states the plains include the great plains of the west and the tail grass prairie to the south of the great lakes extending east to the appalachian plateau

your answer is b hope that