12th » Austria regains its independence as the Allied-occupied Austria named Allied occupation following World War II ends.
14th » Cold War: Eight Communism e.g Communist bloc countries, including the Soviet Union, sign a mutual defense treaty called the Warsaw Pact.
18th » Operation Passage to Freedom, the evacuation of 310,000 Vietnamese people or Vietnamese civilians, soldiers and non-Vietnamese members of the French Union known as French Army from communist North Vietnam to South Vietnam following the end of the First In
25th » In the United States, a night-time Fujita scale e.g F5 tornado strikes the small city of Udall, Kansas, killing 80 and injuring 273. It is the deadliest tornado to ever occur in the state and the 23rd deadliest in the U.S.
25th » First ascent of Kangchenjunga (8,586 m.), the third-highest mountain in the world, by a British expedition led by Charles Evans (mountaineer) named Charles Evans. Joe Brown (climber) or Joe Brown and George Band reached the summit on May 25, followed by N