What was on effect of al-qaeda’s september 11, 2001, attack on the world trade center in new york and the pentagon in virginia?

The main effect after the attacks of September 11, perpetrated by the terrorist organization Al Qaeda, was the start of the War on Terror and the Bush Doctrine of preventive attack. As a result of these changes, less than a month later the Afghanistan War began, because this country was governed by the Taliban that provided refuge to many of the high command of al Qaeda, including Osama Bin Laden, who as a consequence from the invasion he had to escape to the mountains of Pakistan. Then, in 2003, the War in Iraq followed the guidelines of the Bush Doctrine, due to suspicions that Saddam Hussein's authoritarian regime was developing weapons of mass destruction.

explanation:

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the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.