What do we celebrate on the Fourth of July?

The celebration on the Fourth of July is known as Independence Day, which commemorates the adoption of the Declaration of Independence on July 4, 1776. This pivotal moment marked the thirteen American colonies' assertion of independence from British rule. Independence Day is celebrated with various traditions, including fireworks, parades, and barbecues, as it symbolizes the birth of the United States and its commitment to the ideals of freedom and democracy.

The other options represent different holidays: Memorial Day honors those who have died in military service, Thanksgiving celebrates gratitude and harvest, and New Year's Day marks the beginning of the new year. Each of these has its unique significance and traditions, but they do not relate to the historical events associated with the Fourth of July. Therefore, the choice of Independence Day is correct as it directly corresponds to the national significance of the date.