Describe the primary changes in the security industry post the 9/11 terrorist at

Describe the primary changes in the security industry post the 9/11 terrorist attacks. In addition, compare and contrast security in the United States; pre-9/11 and post 9/11.
Describe in detail the purpose and reasoning for prioritization of assets and risks. Commence your response by defining the purpose of risk management, then develop the overall concept of risk management.
Paper must be at a minimum of 2-3 pages per question for a total of 4-6 pages (the Title and Reference pages do not count towards the minimum limit).
Scholarly and credible references should be used. A good rule of thumb is at least 2 scholarly sources per page of content.
Type in Times New Roman, 12 point and double space.
Follow the current APA Style as the sole citation and reference style used in written work submitted as part of coursework. 
Points will be deducted for the use of Wikipedia or encyclopedic type sources. It is highly advised to utilize books, peer-reviewed journals, articles, archived documents, etc.