Modern Homeland National Security

1. Post 9/11 how did the US government initially respond to protecting the homeland? How did this differ from past efforts? Was it successsful and if so why?
2. Compare how critical infrastructure (CI) was an important factor in those actions to how our government today is strengthening and maintaining secure, functioning, and resilient critical infrastructure.
Sources:
https://www.dhs.gov/mission
https://www.dhs.gov/xlibrary/assets/executive-order-13231-dated-2001-10-16-initial.pdf
https://georgewbush-whitehouse.archives.gov/news/releases/2007/10/20071009-1.
html
https://www.dhs.gov/sites/default/files/publications/nat-strat-hls-2002.pdf
https://www.justice.gov/archive/ll/highlights.htm
https://www.dhs.gov/sites/default/files/publications/qhsr/the-2014-quadrennial-homeland-security-review-overview.pdf