the.com/pledge of allegiance

means A formal spoken promise of loyalty to the United States and its flag, typically recited with a hand over the heart.

from Written in 1892 by Francis Bellamy, a Baptist minister and socialist, to mark the 400th anniversary of Columbus's voyage and to promote flag-making sales for a magazine campaign. The original text read 'my flag' rather than 'the flag of the United States of America' — that phrase was added in 1923 to ensure immigrants pledged to America's flag specifically, not any flag. The words 'under God' were inserted in 1954, during the Cold War, as a deliberate contrast to atheistic communism.