On December 7, 1787, Delaware became the first state to ratify the Constitution of the United States, and has since been known as The First State. More than half of all U.S. publicly traded companies, and 63% of the Fortune 500, are incorporated in Delaware. There is no sales tax in Delaware, which means the state’s various malls and outlets are major attractions for tourists looking to save year-round. Countryaah.com: Offers a full list of nationwide and statewide holidays in Delaware starting from January 1st – New Year’s Day. Also covers the most recent three years of public holidays within the state of Delaware.