On March 20, 2003, a coalition of countries, principally the United States and Great Britain, invaded Iraq. The war happened because Saddam Hussein had developed or was in the process of developing chemical weapons and weapons of mass destruction. It affected the world by costing the United States and its allies $60 billion and helped set off an economic recession caused in part by a spike in oil prices.
Gulf War 2
The 2004 enlargement of the European Union was the largest single expansion of the European Union, in terms of territory, number of states, and population to date. Eight countries of central and eastern Europe the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Slovakia and Slovenia joined the EU, finally ending the division of Europe. This was decided by the 'Great Powers' 60 years earlier at the Yalta Conference Cyprus and Malta also become members. It affected the world by boosting the growth of resources.
The European Union
The Mars Rover lands on Mars and began exploring the planet. The rover has sent more than 100,000 high-resolution, full-color images of the planet’s surface. First among the mission's scientific goals was to search for and characterize a wide range of rocks and soils for clues to prove water activity on Mars. The rover targeted sites on Mars that looked like they were affected by liquid water in the past. The rover landing affected the world by seeing if there was any life on Mars.