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The immediate result was the grounding of air traffic in the US. The legal result was the Patriot Act and the establishment of the Department of Homeland Security. The major foreign policy result was the "War on Terror" which led to the US invasion of Afghanistan (to eliminateg al-Qaeda's training camps), and the subsequent removal of the Saddam Hussein regime in Iraq.
War on Terror
The attack on the US by Japan in Hawaii. The next day, Germany declared war on the US. Game on.
The United States invaded Afghanistan with the goal of eliminating al-Qaeda's training camps
The president was allowed to take all necessary measures to repel any armed attack against the forces of the United States
The direct result of aerobic respiration is the production of ATP from the breakdown of glucose.
Approximately 2,753 people died in the attack on the World Trade Center towers on September 11, 2001.
Beats are the direct result of the interference that is caused by the difference in frequencies of two sound waves.
On 1st September 1939, German troops invaded Poland. In response to that invasion, Britain and France declared war on Germany on 3rd September 1939.
Ripple marks are a feature of mountains that are not a direct result of mountain building.
The current NATO involvement in Afghanistan is the direct result of the terrorist attack of September 11, 2001. That attack was the work of Osama bin Laden as leader of al Qaeda, with the support of Mullah Omar of the Taliban. They have lots of reasons why it was necessary to attack the US, but nonetheless, there was no hostility between the US and Afghanistan prior to that attack (indeed, the US had strongly supported bin Laden when he was fighting off a Soviet invasion of Afghanistan, some years previously). So it was their decision to go to war. The US and its NATO allies responded in self defense.
The American "War on Terror" was a direct result of the SEPTEMBER 11TH ATTACKS on the World Trade Center and Pentagon, which was committed by al-Qaeda Terrorists.