USA vs Mexico

https://en.wikipedia.org/wiki/Mexican%E2%80%93American_War
https://en.wikipedia.org/wiki/List_of_the_largest_trading_partners_of_the_United_States
http://www.worldometers.info/world-population/us-population/
http://www.worldometers.info/world-population/mexico-population/
http://www.pewresearch.org/fact-tank/2017/09/18/how-the-u-s-hispanic-population-is-changing/
https://en.wikipedia.org/wiki/Mexican_Armed_Forces
http://www.pewresearch.org/fact-tank/2017/04/27/5-facts-about-illegal-immigration-in-the-u-s/
https://www.theguardian.com/commentisfree/2017/jan/23/trump-futures-mexico-us-interlocked-wall-border
https://www.globalfirepower.com/country-military-strength-detail.asp?country_id=mexico
https://scout.com/military/warrior/Article/US-Militarys-20-Most-Dangerous-Weapons-101458082
https://en.wikipedia.org/wiki/Mexican_Army
http://www.thedrive.com/the-war-zone/5261/the-mexican-air-force-no-longer-has-any-fighter-aircraft-in-its-inventory