One belief is that God created the world, then Adam and Eve. This is explained in the book of Genesis in the Bible.

Another belief is that there was a “Big Bang”. According to the big bang theory, the universe was created sometime between 10 billion and 20 billion years ago from a cosmic explosion that hurled matter in all directions. God could of also created the Big Bang.

Stone Age - tools and weapons were made of stone
Bronze Age - most tools and weapons were made of bronze (from about 4000-3000 BC to about 1000 BC)
Iron Age – most tools and weapons were made of iron (from about 1000 BC)

3.2 million years ago - oldest fossil skeleton of a human ancestor
c. 2540 B.C. - Pyramids of Egypt constructed
1232 - Rockets invented in China
1348 - The plague appeared in Europe
1390 - The first paper mill began operating in Germany
1450 - Telescope invented
1608 - Printing Press invented
1619 - The first slaves transported to America
1704 - United Kingdom of Great Britain formed
1773 - The Boston Tea Party
1774 - First Continental Congress drafts “Declaration of Rights and Grievances”
1776 - Declaration of Independence
1778 - Hawaii discovered
1789 - First president of the United States (George Washington)
1790 - U.S. population about 3,929,000, including 698,000 slaves
1793 - Cotton gin invented
1796 - smallpox vaccination begins
1799 - Rosetta Stone discovered in Egypt (created in 196 BC)
1807 - First Steamboat "Clermont" sails
1814 - Locomotive engine invented
1833 - Slavery abolished in British Empire
1838 - Photography invented
1842 - first anesthetic used (ether)
1844 - First telegraph message transmitted
1849 - California gold rush begins
1858 - First trans-Atlantic telegraph cable completed
1864 - Pasteurization invented
1866 - dynamite invented
1867 - Trans-Atlantic cable laid
1867 - Steam engine motorcycle invented
1872 - Brooklyn Bridge opens
1873 - Color photography invented
1876 - Telephone invented
1877 - Phonograph invented
1879 - Electric light bulb invented
1882 - Edison created the first large power station in NYC
1885 - First practical automobile to be powered by an internal-combustion engine.
1885 - First gas engine motorcycle invented
1885 - Box camera invented
1885 - World's first skyscraper built in Chicago
1886 - Coca Cola invented
1887 - first Sherlock Holmes story (A Study in Scarlet)
1888 - pneumatic tire invented
1895 - X-rays discovered
1899 - Wireless telegraph service established between England and France
1890 - First electrocution in the electric chair
1892 - Diesel engine invented
1893 - First car built by Henry Ford
1893 - Zipper invented
1901 - First successful radio receiver
1902 - Air conditioner invented
1903 - Wright brothers' airplane remained in flight for 12 seconds
1906 - Cornflakes invented
1908 - Model T automobile produced
1913 - Motion pictures with sound invented
1917 - Germany - the first major military use of airplanes to drop bombs on cities
1920 - Women get the right to vote
1920 - Alcohol prohibition began (ended 1932)
1926 - First liquid-fueled rocket launched
1927 - First television transmission (England)
1927 - Aerosol can patented
1928 - Penicillin discovered
1932 - Polaroid photography invented
1936 - Hoover Dam completed
1938 - Ballpoint pen invented
1938 - Teflon invented
1939 - The first regular TV broadcast in the U.S.
1939 - First successful helicopter invented
1945 - The first atomic bomb was detonated at Hiroshima, Japan. About 70,000 people were killed instantly; about 30,000 more people died within several weeks
1946 - First programmable computer constructed
1947 - Transistor invented
1957 - The first satellite, Sputnik, put into Earth orbit (Soviet Union)
1959 - First unmanned spacecraft hit the moon (Soviet Union)
1961 - A person orbited the Earth for the first time (Yuri Gagarin)
1961 - First American in space (Alan Shepard)
1964 - Unmanned U.S. spacecraft transmitted television pictures of the moon before hitting the surface
1965 - The first "space walk" (Soviet Union)
1965 - The first unmanned spacecraft to Mars (Mariner 4)
1966 - The first unmanned soft landing on the moon (Soviet Union)
1967 - China enters the nuclear age
1968 - Human beings orbited the moon for the first time (Apollo 8)
1969 - People walked on the moon for the first time (Apollo 11)
1971 - First unmanned successful landing on Mars (Soviet Union)
1973 - Pioneer 10 reaches Jupiter
1975 - First unmanned soft landing on Venus (Soviet Union)
1975 - US & Soviet spacecraft dock in space
1975 - Invention of the CAT scanner
1976 - Viking 1 & 2 land on Mars
1981 - Personal computer introduced
1982 - First launch of communications satellites into orbit by space shuttle
1983 - First American woman in space (Sally Ride)
1984 - AIDS identified
1985 - Hole in Ozone Layer discovered
1986 - Chernobyl nuclear plant accident
1986 - Voyager 2 reaches Uranus
1997 - Sheep cloned
2009 - First black US President elected (Barack Obama)
2009 - US Population 305,000,000