Fact: The term "Cold War" was coined by George Orwell (1945) and popularized by Bernard Baruch (1947). Fun fact: Direct superpower conflicts were avoided due to mutually assured destruction (MAD)—the knowledge that nuclear war would annihilate both sides. The Cold War lasted 44 years, cost $8 trillion in military spending, and caused 10-15 million deaths in proxy wars (Korea, Vietnam, Afghanistan, etc.). The Soviet Union dissolved on December 26, 1991, ending the Cold War.

Fact: The Berlin Wall was a complex system of concrete walls (mostly 12 ft high), barbed wire fences, watchtowers, anti-vehicle trenches, and a "death strip" with armed guards. Fun fact: The wall evolved over time—by the 1980s, it included 302 watchtowers, 259 dog runs, and 20 bunkers. 140 people were killed trying to cross. The wall fell on November 9, 1989, after an East German official mistakenly announced immediate border openings; 2 million East Germans crossed into West Berlin that night.

Fact: The US imposed a naval blockade ("quarantine") around Cuba. Fun fact: At the crisis peak, US nuclear bombers were in the air constantly, and Soviet submarine commanders (without Moscow contact) considered launching nuclear torpedoes. A deal resolved the crisis: Soviets removed Cuban missiles; US secretly removed Jupiter missiles from Turkey. Robert Kennedy described the chance of nuclear war as "between 1 in 3 and even." The crisis led to the Moscow-Washington hotline (1963) for direct communication.

Fact: The US deployed 543,000 troops at peak (1969). Fun fact: The average US soldier was 19 years old (WWII average was 26). Agent Orange (herbicide) caused severe health issues for 3 million Vietnamese and 300,000 US veterans. The war cost $168 billion ($1 trillion today). The fall of Saigon (April 30, 1975) is shown in iconic photos of helicopters evacuating the US embassy. The war deeply divided American society and led to the War Powers Act (1973).

Fact: Sputnik 1 (183 lbs) orbited Earth every 96 minutes. Fun fact: The US created NASA in 1958 in response to Sputnik. Gagarin's flight lasted 108 minutes. President Kennedy announced the Moon goal in 1961; Apollo 11 astronauts Neil Armstrong and Buzz Aldrin spent 21.5 hours on the lunar surface. The USSR secretly attempted Moon landings but failed due to rocket explosions. The Apollo program cost $25.4 billion ($200 billion today) and employed 400,000 people.

Fact: The Marshall Plan provided $13.3 billion ($150 billion today) to 16 Western European countries. Fun fact: The Soviet Union banned Eastern Bloc countries from accepting Marshall Plan aid. Plan architect George C. Marshall (US Army Chief of Staff during WWII) won the Nobel Peace Prize (1953). Western European industrial production increased by 200% between 1948-1952. The Truman Doctrine pledged US support for "free peoples resisting attempted subjugation by armed minorities or outside pressures."

Fact: The Korean War ended in an armistice (not a peace treaty), leaving Korea divided at the 38th parallel. Fun fact: The war lasted 3 years and 1 month, with 2.5 million total casualties (including 36,000 US dead). The Demilitarized Zone (DMZ) is 2.5 miles wide and 160 miles long, guarded by 2 million soldiers total. North and South Korea remain technically at war today. The war saw the first large-scale jet fighter battles (MiG-15 vs F-86 Sabre).

Fact: The US provided Stinger anti-aircraft missiles to mujahideen via Pakistan's ISI. Fun fact: Soviet soldiers called Afghanistan the "38th parallel of Asia" (referencing Korea's stalemate). The war killed 1 million Afghan civilians and displaced 5 million refugees. The Soviet withdrawal began May 1988, completed February 1989. The experience demoralized the Soviet military and eroded domestic support for the communist regime. Bin Laden later formed Al-Qaeda using networks established during the anti-Soviet jihad.

Fact: NATO's Article 5 (collective defense) has been invoked only once—after the 9/11 attacks. Fun fact: West Germany joined NATO in 1955, prompting the USSR to create the Warsaw Pact with East Germany, Poland, Czechoslovakia, Hungary, Romania, Bulgaria, and Albania. The Warsaw Pact had 7.5 million troops to NATO's 5 million. The Pact dissolved in 1991; NATO expanded eastward after the Cold War, now with 31 members (including former Warsaw Pact nations).

Fact: Gorbachev won the Nobel Peace Prize (1990) for ending the Cold War. Fun fact: The Soviet economy had shrunk by 30% by 1990. Glasnost allowed criticism of the Communist Party, leading nationalist movements in Soviet republics. Perestroika decentralized economic control but caused shortages. The failed August 1991 coup against Gorbachev by hardliners weakened him; Boris Yeltsin (Russian Federation president) emerged as leader. On December 25, 1991, Gorbachev resigned, and the Soviet flag was lowered from the Kremlin.

Fact: The invasion used blitzkrieg ("lightning war") tactics—coordinated air strikes, tanks, and infantry. Fun fact: The Soviet Union invaded Poland from the east on September 17, 1939, as part of the secret Molotov-Ribbentrop Pact with Nazi Germany. Poland was defeated in 6 weeks. Britain and France declared war on September 3, but no major combat occurred until spring 1940 (the "Phoney War").

Fact: President Franklin D. Roosevelt called it "a date which will live in infamy." Fun fact: The attack destroyed 188 US aircraft and 8 battleships, but aircraft carriers (the future key naval weapon) were at sea. 1,177 crew died on USS Arizona alone. Germany and Italy declared war on the US on December 11, 1941. The US declared war on Japan on December 8. Isolationism ended overnight—4 million Americans volunteered in 1942.

Fact: Operation Overlord involved 6,939 vessels and 11,590 aircraft. Fun fact: Omaha Beach was the deadliest with 2,400 American casualties. The Allies suffered approximately 10,000 total casualties (killed, wounded, missing) on D-Day, with 4,414 confirmed dead. German Field Marshal Rommel was home celebrating his wife's birthday. By June 11, 326,000 troops, 54,000 vehicles, and 104,000 tons of supplies had landed. Paris was liberated on August 25, 1944.

Fact: The "Final Solution" used extermination camps including Auschwitz-Birkenau (1.1 million killed), Treblinka (800,000), and Sobibor (250,000). Fun fact: The largest single massacre was at Babi Yar (September 1941), where 33,771 Jews were shot in two days in a Ukrainian ravine. Only about 200,000 of Europe's 9 million pre-war Jews survived in German-occupied territory. Anne Frank's diary, written while hiding in Amsterdam, has sold over 30 million copies worldwide.

Fact: The bombs "Little Boy" (uranium) and "Fat Man" (plutonium) had yields of 15 and 21 kilotons of TNT. Fun fact: The original target list included Kyoto, but Secretary of War Henry Stimson (who had honeymooned there) removed it for cultural reasons. The bombings remain the only use of nuclear weapons in warfare. Japan formally surrendered on September 2, 1945, aboard the USS Missouri. Total WWII deaths from all causes: 70-85 million (3% of world population).

Fact: The 5-month battle ended with the surrender of German Field Marshal Paulus's Sixth Army (91,000 soldiers). Fun fact: Only 6,000 German survivors returned home, some not until 1955. Soviet snipers, including Vasily Zaytsev (242 confirmed kills), used the city's rubble for cover. The German soldier's daily ration fell to 1 slice of bread and 2 tablespoons of flour per day. Hitler promoted Paulus to Field Marshal (expecting suicide), but Paulus surrendered.

Fact: The Battle of Britain was an air campaign: Germany's Luftwaffe vs. Britain's Royal Air Force (RAF). Fun fact: Winston Churchill famously said, "Never in the field of human conflict was so much owed by so many to so few" (the "Few" were 2,936 RAF pilots). The battle lasted July-October 1940. Germany lost 1,733 aircraft, Britain 915. Hitler postponed and eventually canceled Operation Sea Lion (the invasion of Britain). This was Nazi Germany's first major defeat.

Fact: Approximately 10,000-20,000 died on the march or in prison camps. Fun fact: Japanese commanders were later tried for war crimes; General Masaharu Homma was executed in 1946. Survivors endured beheadings, bayonetings, and shooting of anyone who fell. The march lasted 6-12 days. After the war, the Japanese emperor Hirohito was not prosecuted due to US political calculations. The Bataan Death March is commemorated annually by US and Filipino veterans.

Fact: Led by J. Robert Oppenheimer, the project produced Trinity (first test) on July 16, 1945. Fun fact: Oak Ridge, Tennessee (population 75,000), didn't appear on maps. Soviet spies (including Klaus Fuchs) infiltrated the project, accelerating Stalin's bomb program. The German atomic program failed partly because Heisenberg miscalculated critical mass. Oppenheimer quoted the Bhagavad Gita after Trinity: "Now I am become Death, the destroyer of worlds."

Fact: The UN Charter was signed in San Francisco on June 26, 1945, effective October 24. Fun fact: The term "United Nations" was first used by President Roosevelt in 1942. The UN has 193 member states today. The Security Council's veto power (each permanent member can block any resolution) reflects post-WWII power realities. The UN has 15 specialized agencies, including WHO, UNESCO, and the World Bank. The UN budget is about $3 billion annually.