- 
  
  Chinese troops open fired on pro-democracy supporters in Beijing. The death toll was near 1,000.
 - 
  
  Mount St. Helens erupted.
 - 
  
  Iraqi President Saddam Hussein declared holy war against Iran
 - 
  
  Ronald Reagan became the 40th President of the US
 - 
  
  US national debt hit $1 trillion.
 - 
  
  Argentine troops seized the Falklan Islands from Great Britain.
 - 
  
  Argentina surrendered to Great Britain, which ended the Falklands Islands conflict.
 - 
  
  Chinese Premier Zhao Ziyang and British Prime Minister Margaret Thatcher signed the Sino-British Joint Declaration to transfer Hong Kong back to China in 1997.
 - 
  
  Concerts held at Wembley Stadium and John F. Kennedy Stadium raised over $70 million for African famine relief.
 - 
  
  US President Ronald Reagan and Soviet leader Mikhail Gorbachev met for first time.
 - 
  
  A reactor at Chernobyl nuclear power station in USSR exploded, 31 died, and radioactive contamination reached much of Western Europe.
 - 
  
  Americans held hands from California to New York.
 - 
  
  Stock markets around the world crashed.
 - 
  
  Ceasefire between Iran & Iraq took effect after 8 years of war.
 - 
  
  Al-Qaeda formed.
 - 
  
  Soviet President Mikhail Gorbachev and US President George H. W. Bush declared the Cold War over.
 - 
  
  Nelson Mandela released after 27 years imprisonment.
 - 
  
  Hubble space telescope was placed into orbit by shuttle Discovery and sent its first photo from space one month later.
 - 
  
  US deployed troops to Saudi Arabia, beginning Operation Desert Shield.
 - 
  
  East and West Germany were reunified.
 - 
  
  The IRA launched a mortar attack on 10 Downing Street during a cabinet meeting.
 - 
  
  Gulf War ended after Iraq accepted a ceasefire.
 - 
  
  World Wide Web debuted as a publicly available service on the Internet.
 - 
  
  The Maastricht Treaty was signed by 12 countries from the European Community to create the European Union.
 - 
  
  US Marines landed in Somalia for Operation Restore Hope.
 - 
  
  The Rwandan Genocide began with the assassination of Rwandan President and Burundian President, which abruptly ended peace negotiations.
 - 
  
  Nelson Mandela became South Africa's 1st black president.
 - 
  
  Amazon.com founded by Jeff Bezos.
 - 
  
  The Dayton Agreement was signed in Paris by leaders of various governments, which ended the conflict in former Yugoslavia.
 - 
  
  Osama bin Laden issued a message entitled "A declaration of war against the Americans occupying the land of the two holy places".
 - 
  
  US President Bill Clinton signed welfare reform into law.
 - 
  
  United Kingdom returned Hong Kong and the New Territories to the People's Republic of China.
 - 
  
  Diana, Princess of Wales, died in a car crash in a road tunnel.
 - 
  
  Google.com was registered as a domain name.
 - 
  
  The Good Friday/Belfast Agreement for Northern Ireland was signed by the British and Irish governments.
 - 
  
  Omagh bombing in Northern Ireland killed 29 people and injured about 220.
 - 
  
  US President Bill Clinton admitted in taped testimony that he had an "improper physical relationship" with the intern and the had "misled people" about the relationship.
 - 
  
  US President Bill Clinton was acquitted by the Senate in his impeachment trial.
 - 
  
  Eric Harris and Dylan Klebold killed 13 people and injured 24 others before committing suicide at Columbine High School, Colorado.
 - 
  
  Bush won in result of the controversial presidential election.
 - 
  
  Wikipedia was launched by Jimmy Wales and Larry Sanger.
 - 
  
  The Netherlands became the first country in the world to make same-sex marriage legal.
 - 
  
  Two planes hijacked by Al Qaeda crashed into New York's World Trade Towers, which caused both towers to collapse and killed 2,752 people
 - 
  
  US President George W. Bush declared a "war on terror".