How the early 19th century role of the citizen differed from that of the revolutionary era. phrased another way, what did the term "citizen" mean in 1787 and in 1830?

See the explanation below.

Explanation:

In 1787 the United States constitution was drafted, but the constitution did not explained anything about citizenship. However, it mentioned about the "citizen of the United States" at that time the infant United states followed the concept of British common law and accepted the rule of Place of birth.

In 1790 Naturalization act was enacted in the United States which provided the first ever rules which need to be followed to grant the national citizenship to free white people.

In 1848 Treaty of Guadalupe was signed which extended the citizenship to all persons living within the territory of the United States following the Mexican war.

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

its c not d   tell me if that´s correct