“Juneteenth” will be celebrated on June 19 this year. Here’s a helpful introduction to this American national holiday, from Wikipedia: “Juneteenth, officially Juneteenth National Independence Day, is a federal holiday in the United States. It is celebrated annually on June 19 to commemorate the ending of slavery in the United States. The holiday’s name is a portmanteau of the words “June” and “nineteenth”, as it was on June 19,...