1909 - July 4, Max Henius is the driving force behind the first July 4th celebration of Danish American friendship at the Aarhus Expo. The expo actually ran from May to October with approximately 667,000 visitors. Over the next three years, Henius leads an effort to purchase land at Rebild Bakker, presents the deed to King Christian X, and the annual July 4 Rebild Festival is born. Henius was also influential in the re-establishment of the Danish-German border as he successfully lobbies President Woodrow Wilson to include a referendum proposal in the final Treaty of Versailles in 1919. Slesvig area residents were then allowed to vote for the re-establishment of the border in 1919, with the formal reunification on June 15, 1920.
1912 - Rebild National Park Society established by Danish immigrant Max Henius in Chicago, Illinois. Celebration each July 4 in the Rebild Hills near Aalborg, Denmark to recognize the friendship between Denmark and the United States.