How does the Star Spangled Banner show nationalism?

Before the war, Americans rarely used the flag to express patriotism. But the flag's appearance over Fort McHenry during the Battle for Baltimore and Francis Scott Key's poem “The Star-Spangled Banner” inspired the public. After the war, the flag was often displayed as a symbol of national pride and unity.

Explanation:

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.