Discuss what is considered critical infrastructure in the United States and why it is threatened as it relates to homeland security? The United States Department of Homeland Security: An Overview (Pearson Criminal Justice) 2nd Edition. https://www.youtube.com/watch?v=R9FtivBOLNE https://www.cisa.gov/critical-infrastructure-sectors https://www.cisa.gov/sites/default/files/publications/national-infrastructure-protection-plan-2013-508.pdf https://www.cisa.gov/sites/default/files/publications/national-infrastructure-protection-plan-2013-508.pdf https://www.justice.gov/archive/ll/what_is_the_patriot_act.pdf https://www.cisa.gov/sites/default/files/publications/ISC-PPD-21-Implementation-White-Paper-2015-508.pdf https://www.dhs.gov/xlibrary/assets/dhs-risk-lexicon-2010.pdf https://scholarship.law.duke.edu/cgi/viewcontent.cgi?article=3172&context=dlj https://www.law.cornell.edu/supremecourt/text/489/189