In 2003, a long time ago, there were many important events that happened around the world. Do you know what "important events" means? It means things that were very significant and had a big impact on people's lives or the world as a whole.
One big thing that happened in 2003 was that the United States, which is a big country in North America, started a war with another country called Iraq. This war was started because the United States believed that Iraq was making dangerous weapons that could hurt people, and they wanted to stop them from doing that.
Also, in 2003, there was a really bad outbreak of a disease called Severe Acute Respiratory Syndrome (SARS), which spread all around the world and made a lot of people sick. People were very worried about this disease, and many countries took strong measures to stop it from spreading any further.
One more important thing that happened in 2003 was that a man named Arnold Schwarzenegger became the governor of California, which is a big state in the United States. "Governor" is a title given to the leader of a state or province. Schwarzenegger was famous before he became governor because he was a very successful actor who starred in many big movies.
So that's a little bit about what happened in 2003. It was a very eventful year with lots of things going on around the world.