http://pinzler.com/ushistory/timeline3.html
http://mappinghistory.uoregon.edu/english/US/US09-01.html
http://guides.newman.baruch.cuny.edu/c.php?g=188261&p=1243487
http://www.newberry.org/american-history-colonial-period-revolutionary-era-and-early-republic
http://upload.wikimedia.org/wikipedia/commons/5/54/Cotton_gin_EWM_2007.jpg
http://beaconforlife.blogs.com/pastoral_coach/LC-at-Three-Forks.jpg
https://www.cardcow.com/images/set64/card00301_fr.jpg
http://upload.wikimedia.org/wikipedia/commons/1/1d/NYmohawk-ErieCanalRexford.JPG
http://hoocher.com/Charles_Willson_Peale/Lewis_Clark_Expedition_Map.jpg
http://en.wikipedia.org/wiki/Adams%E2%80%93On%C3%ADs_Treaty
http://en.wikipedia.org/wiki/Treaty_of_Paris_(1783)
https://www.google.com/?gws_rd=ssl#safe=strict&q=texas+annexation+1845
http://www.learner.org/interactives/historymap/states_oregon.html
http://en.wikipedia.org/wiki/Mexican_Cession
http://www.historytoday.com/richard-cavendish/gadsden-purchase
http://mappinghistory.uoregon.edu/english/US/US09-01.html
http://guides.newman.baruch.cuny.edu/c.php?g=188261&p=1243487
http://www.newberry.org/american-history-colonial-period-revolutionary-era-and-early-republic
http://upload.wikimedia.org/wikipedia/commons/5/54/Cotton_gin_EWM_2007.jpg
http://beaconforlife.blogs.com/pastoral_coach/LC-at-Three-Forks.jpg
https://www.cardcow.com/images/set64/card00301_fr.jpg
http://upload.wikimedia.org/wikipedia/commons/1/1d/NYmohawk-ErieCanalRexford.JPG
http://hoocher.com/Charles_Willson_Peale/Lewis_Clark_Expedition_Map.jpg
http://en.wikipedia.org/wiki/Adams%E2%80%93On%C3%ADs_Treaty
http://en.wikipedia.org/wiki/Treaty_of_Paris_(1783)
https://www.google.com/?gws_rd=ssl#safe=strict&q=texas+annexation+1845
http://www.learner.org/interactives/historymap/states_oregon.html
http://en.wikipedia.org/wiki/Mexican_Cession
http://www.historytoday.com/richard-cavendish/gadsden-purchase
http://campus.kellerisd.net/Teachers/15228/Classroom%20Information/STAAR%20Social%20Studies%208%20Review.pdf