TIL that there was a referendum in 1916 in Denmark to sell the Danish West Indies (now United States Virgin Islands) to the US. Only those living in Denmark (including the Faroe Islands) can vote while the residents of the islands could not. About 64% of the voters said yes.
TIL about the campaign of Authenticité in the DR Congo (prev. Zaïre) in the 60s and 70s where Mobutu Sese Seko attempted to remove everything considered reminders of colonial rule. Place names were renamed, traditional names must be used over Christian names, and Western clothing was banned.
TIL in Australia, Cocos (Keeling) Islands has a Muslim majority. The culture of the islands is similar to Malaysia and Indonesia due to the population being mostly ethnic Malay and they speak a variety of Malay called Cocos Islands Malay.
TIL in Egypt and Sudan, there is a group of Hungarians living there called Magyarabs. They live along the Nile and their ancestors came to the area when Hungary was part of the Ottoman Empire and married the local population. Today, they speak Arabic and not Hungarian.
TIL in 1957, the Blue Hawaii cocktail was created when a representative of the Dutch distiller Bols asked a bartender, Harry Yee to develop a drink using its blue curaçao liqueur.
TIL that after WWII, mutton consumption declined and almost disappeared in the US. American GI's were fed canned mutton during the war and looked down on the meat ever since.
TIL that before the Napoleonic Wars, the French government under Napoleon offered 12,000 francs (about $50-80k today) to develop a way to preserve food for military rations. That was awarded to Nicolas Appert in 1810 because he developed a method for sealing food in glass jars.
TIL that in 1913, California banned "aliens ineligible for citizenship" from owning agricultural land or leasing it long-term, leases could only go up to 3 years. These laws lasted until 1952. The policies affected Asian immigrant farmers including the Japanese.
TIL that in parts of Ancient Greece like Sparta and Crete, men in social and religious groups had common meals together called syssitia. In Sparta, it was obligatory to attend them daily.
TIL that Ancient Greeks had two ways of saying compass directions, one based on winds and another based on astronomical phenomena. Ancient Greek philosophers like Aristotle developed wind systems for this.
TIL that in Georgia, Florida, and North and South Carolina, there is a group of African Americans that preserved much of their culture and language called the Gullah people.
TIL that since 2005, tennis courts in the US Open have been painted blue inside the lines to make the ball easier to see. The color was even trademarked as "US Open Blue."