Why was the Patriot Act created after the 9/11 attacks?

The Patriot Act was started following the September 11 attacks with the stated goal of dramatically tightening U.S. national security, particularly as it related to foreign terrorism, increased penalties for terrorism crimes and an expanded list of activities which would qualify someone to be charged with terrorism.

Explanation:

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.