Causes of 9/11:
The terrorist organization wanted to retaliate for the U.S.' supporting Israel, its involvement in the Gulf War, and the military presence in the Middle East. Another plausible explanation for the attacks on 9/11 can be traced to some of the hatred that terrorist groups feel about the freedom in the United States. The CIA also has some involvement with Osama Bin-Laden, the founder of al-Qaeda.
Effects of 9/11:
The war in Afghanistan began shortly after the attacks a month later, on October 7. They had a goal to drive the Taliban out of ruling power after the inhabitants of Bin-Laden and the rest of the members of al-Qaeda. The United States and Afghanistan have been long-time allies in the hopes of combating al-Qaeda. Since then, the United States and joining forces have waged constant war with the Middle East. It then ended on December 28, 2014, after the span of thirteen years. The biggest effect of the 9/11 attacks is the War on Terror that has involved numerous parts of the world.