What is the poem "The Flag We Love" expressing to the reader?

The poem "The Flag We Love" is expressing patriotism.

Explanation:

A patriotic poem celebrating the flag of the United States, accompanied by notes on roles the flag has played in American history and culture.

Ryan opens her book by explaining that the American flag is the symbol of the country and everything good that it represents: 'It's a promise for our future, a reminder of our past.' At the bottom of each page, she includes some interesting information about the flag.

It introduces young readers to our national symbol and the ideals for which it stands (""Americans stand together / Before ceremonies start / And promise their allegiance / With their hands across their hearts""), while prose insets offer historical tidbits in a sidebar format.