How has national security impacted civil liberties?

The Department of Homeland Security was established after the terrorist attacks on September 11, 2001. Through the establishment of the Department of Homeland Security and enacted legislation, some would say, the U.S. entered a “grey” area when it came to national security vs. civil liberties (first 10 amendments). Compare and contrast national security before and after 9/11. How has national security impacted civil liberties? Are the freedoms given up worth the national security gains? Has the national security excuse been used to push the boundaries of the constitution nationally and internationally? Do not plagiarize! Do not forget to use in text citations. The link below is an example of the APA format. https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/general_format.html