March 1 » Henri Becquerel discovers radioactive decay.
April 6 » In Athens, the opening of the first modern Olympic Games is celebrated, 1,500 years after the original games are banned by Roman emperor Theodosius I.
May 26 » Charles Dow publishes the first edition of the Dow Jones Industrial Average.
June 15 » The deadliest tsunami in Japan's history kills more than 22,000 people.
August 30 » Philippine Revolution: After Spanish victory in the Battle of San Juan del Monte, eight provinces in the Philippines are declared under martial law by the Spanish Governor-General Ramón Blanco y Erenas.
December 10 » Alfred Jarry's Ubu Roi premieres in Paris. A riot breaks out at the end of the performance.
Day of death February 28, 1968
The temperature on February 28, 1968 was between -1.9 °C and 2.3 °C and averaged 0.2 °C. There was 0.3 hours of sunshine (3%). The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the east-northeast. Source: KNMI
March 7 » Vietnam War: The United States and South Vietnamese military begin Operation Truong Cong Dinh to root out Viet Cong forces from the area surrounding Mỹ Tho.
March 18 » Gold standard: The U.S. Congress repeals the requirement for a gold reserve to back US currency.
September 13 » Cold War: Albania leaves the Warsaw Pact.
October 2 » Mexican President Gustavo Díaz Ordaz orders soldiers to suppress a demonstration of unarmed students, ten days before the start of the 1968 Summer Olympics.
October 16 » Tommie Smith and John Carlos are ejected from the US Olympic team for participating in the Olympics Black Power salute.
December 20 » The Zodiac Killer kills Betty Lou Jenson and David Faraday in Vallejo, California.
When copying data from this family tree, please include a reference to the origin: Louis Kramer, "Kramer Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/kramer_stamboom/I600250.php : accessed January 25, 2026), "Roelofke Hiemstra (1896-1968)".
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