General articles on Rome's decline
http://www.history.com/news/history-lists/8-reasons-why-rome-fell
http://www.ushistory.org/civ/6f.asp

Infrastructure/aqueducts in Rome
http://science.howstuffworks.com/environmental/green-science/la-ancient-rome1.htm
http://www.pbs.org/wgbh/nova/ancient/roman-aqueducts.html
• Roman roads - http://www.historytoday.com/logan-thompson/roman-roads

Sampling of Infrastructure problems in US
• US problems - http://www.nbcnews.com/business/economy/baltimores-leaky-infrastructure-seeping-citys-budget-f2D11632745
http://www.washingtonpost.com/local/billions-needed-to-upgrade-americas-leaky-water-infrastructure/2011/12/22/gIQAdsE0WP_story.html
• Susan Collins' office/Maine infrastructure - http://www.collins.senate.gov/public/index.cfm/weekly-column?ID=0944b1f4-c65d-4b04-8b2a-b87df49f00e1
http://www.hicss.hawaii.edu/HICSS_42/BestPapers42/ElectricalPower/ReliabilityAndCyberSecurity.pdf

Foreign policy challenges facing US
http://worldnews.nbcnews.com/_news/2014/01/01/22122831-afghanistan-and-beyond-us-foreign-policy-challenges-in-2014?litehttp://www.bostonglobe.com/opinion/2014/01/02/obama-complicated-foreign-policy-box/1snIGDY2MhBg67ho6Fe6RM/story.htmlhttp://www.cfr.org/afghanistan/prospects-afghanistan-2014/p32094 (especially section from Graeme Smith)• US challenges in Afghanistan - http://www.cfr.org/afghanistan/if-there-no-us-nato-troops-afghanistan-after-2014-happens/p32320
Homeland Security http://www.whitehouse.gov/issues/homeland-security

Agriculture, Food Security, & Climate Change
http://www.epa.gov/climatechange/impacts-adaptation/agriculture.html

Environment
http://www.washingtonpost.com/wp-srv/nation/green/climatesummary/index.html

Health problems in US
http://www.ncbi.nlm.nih.gov/books/NBK44210/

US Military
Recruiting - http://money.cnn.com/2013/05/15/news/economy/military-recruiting/
Active duty - http://www.defense.gov/about/ (especially 4th paragraph)
US Military personnel by country - http://www.cnn.com/interactive/2012/04/us/table.military.troops/ (look for buttons at top right of page to see additional countries)

Labor
Youth Unemployment - http://business.time.com/2012/11/05/why-the-u-s-has-a-worse-youth-employment-problem-than-europe/
US Unemployment - http://money.cnn.com/2014/02/07/news/economy/january-jobs-report/index.html?iid=SF_BN_Lead

Transportation
http://www.gao.gov/products/GAO-12-581T

Treasury
US Debt ceiling - http://money.cnn.com/2014/02/07/news/economy/debt-ceiling-reached/index.html?iid=SF_BN_Lead
US Debt in 1990s - now - http://www.treasurydirect.gov/kids/history/history_1990-2000.htm