Jeeze, how much time do you have? Since 1921, a lot has happened, not the least of which was the birth, celebrated far and wide, of your faithful WikiAnswers correspondent. The other really big stuff:
1) World War II and the Atomic Age
2) Manned moon landing
3) The transistor, which led to the integrated circuit, which led to the computer chip, which led to, among other things, Super Mario for the Nintendo and an iPhone app that makes fart noises.
4) The fall of the Soviet Union
5) Dozens, if not hundreds of miraculous medical improvements from MRIs to CAT Scans and nano-technology.
6) The New Orleans Saints won a Super Bowl
There have been a great many major events that took place in the last 20 years. The Iraq War and 9/11 in New York were very major events.
Glorius Revoulution *Source: PLATOWEB
computer
O.J. Simpson
There are certain issues that have obsessed Americans in the last 50 years. The war in Vietnam, the Soviet Union, American civil rights, the generation of the 60's, black and female liberation, Israel, "Nixon" and last but not least, 9/11.
A few significant events that took place on December 7th include the Hebei Spirit oil spill (2007), the first lethal injection takes place (1982), and the last Apollo mission is launched (1972).
Depends on the date, year, time.
the world wide web the September eleventh attacks the break down of the soviet union
9/ll plane crash in Iran kills thousands
There have been no significant changes in the past thousand years. There have been many solar events though, such as a recent Total Solar Eclipse, where the the galaxy aligned. It happens around once ever 300,000 years or so. You have to understand that the Universe has taken around 14 billion years to get to where it is today, changes in thousands of years are very minuscule and gradual.
Because - previous extinction events happened due to natural causes. Over the last 200 years, the human race has wiped out more species through their selfish domination of the planet - than the last 20,000 years of 'natural' disasters !
There have been a great many major events that took place in the last 20 years. The Iraq War and 9/11 in New York were very major events.
Various significant events have occurred in the country of India over the last five years. These include the launch of a low cost tablet, significant economic growth and the swearing in of a new President.
Glorius Revoulution *Source: PLATOWEB
superbowl
Delhi was changed
It depends on the question itself, do you mean politics, tech, bombings, there is alot that has happened in the last 14 years. Especially, the United States.