Okay kiddo, let me explain it to you in a way that you can understand. In 2003, the United States, along with some other countries, invaded Iraq. But before this happened, there were some important people in the government who had different opinions on whether this was a good idea or not.
One group of people, like President George W. Bush and some members of Congress, believed that Iraq had weapons of mass destruction that could be a danger to the United States and other countries. They thought that the best way to prevent this danger was to invade Iraq and remove their leader, Saddam Hussein.
But there were also people who disagreed with this plan, like some members of Congress and some other countries' leaders. They said that there was no evidence that Iraq had dangerous weapons, and that invading Iraq could cause more harm than good by destabilizing the region and starting a long and costly war.
In the end, the advocates of the war won out, and the invasion happened. But many people still debate whether it was the right decision, and whether the government's positions on the war were well-founded or not.