Final answer:
Veterans Day began with an observance that marked the end of World War I. It started as Armistice Day and later became Veterans Day.
Step-by-step explanation:
The observance that marked the end of World War I is considered to be the beginning of Veterans Day. World War I, also known as the Great War, officially ended with the signing of the armistice on November 11, 1918. This day became known as Armistice Day and later evolved into what we now celebrate as Veterans Day.
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