It is believed that before 30,000 years, the current Native Americans migrated from Asia and then settled in all of the North America, they were the original habitants of America before the Europeans settled and they cultivated their own civilizations that lasted for thousands of years.
A young Spanish explorer named Christopher Columbus discovered the North American continent in 1492. In 1607 the first successful settlement in North America was established on the James River in Virginia and it was named Jamestown.
1776, the year of declaration of United States independence when there were 13 colonies under the British rule. This declaration was signed by the 6 founding fathers of America that included George Washington, Benjamin Franklin, Thomas Jefferson, James Madison, Alexander Hamilton and John Adams.
In 1860, the relations between white Americans of North and South became strained as they started having differences on various issues like slavery. This marked the beginning of the Civil war. After the end of the war, Lincoln in his famous Gettysburg addresses redefined the war as a new birth of freedom.
In 1880-1914 after the war and unification of USA, it prospered in all the fields of industry, trade and commerce.
1914-1918: The First World War began in Europe. USA decided to give financial help to the allied powers that consisted of England and France.
1941-1945: The war that had already begun in Europe, reached America when Japan led a surprise attack on Pearl Harbor on December 7th 1941.
1950: When the Americans were expecting the shadow of war to vanish, a new conflict came up. This is popularly known as the Cold War, a power conflict between Soviet Union and USA. It began with the Korean War.
1960: Yuri Gagarin, a Soviet astronaut became the first man in space. This began the space race between the two powers. In 1969, Neil Armstrong became the first human being to set foot on the moon as a part of the Apollo 11 mission. With this USA had won the space race.
2001: On September 11th, two planes hijacked by Al Qaeda terrorists were smashed into the world trade center. This incident began a new war, the war against terrorism.
2003: President Bush attacked Iraq as a part of an effort to save the world from the firepower possessed by Saddam Hussein. This act faced a lot of criticism worldwide.