▁is ▁established ▁as ▁a ▁sub post ▁of ▁Fort ▁Con cho ▁and ▁named ▁in ▁honor ▁of ▁Col . ▁Benjamin ▁H . ▁G ri erson . ▁ 1 9 0 3 ▁Re agan ▁County ▁is ▁car ved ▁from ▁Tom ▁Green ▁County ▁and ▁named ▁for ▁United ▁States ▁Senator ▁John ▁Hen ninger ▁Re agan . ▁St iles , ▁named ▁after ▁local ▁ran cher ▁William ▁G . ▁St iles , ▁becomes ▁the ▁first ▁county ▁seat . ▁ 1 9 1 1 ▁The ▁Kansas ▁City , ▁Mexico ▁and ▁Orient ▁of ▁Texas ▁Railway ▁is ▁completed . ▁ 1 9 2 3 ▁O il ▁is ▁discovered ▁at ▁the ▁Big ▁Lake ▁O il field ▁in ▁the ▁Perm ian ▁Bas in . ▁Big ▁Lake ▁O il field , ▁located ▁on ▁University ▁of ▁Texas ▁System ▁land , ▁opens ▁the ▁Perm ian ▁Bas in ▁to ▁oil ▁production ▁and ▁end ows ▁the ▁P erman ent ▁University ▁Fund . ▁The ▁rig ▁is ▁named ▁Santa ▁R ita ▁# 1 ▁for ▁The ▁Pat ron ▁Saint ▁of ▁the ▁Im possible . ▁Big ▁Lake ▁ ▁is ▁incorpor ated ▁as ▁a ▁city . ▁ 1 9 2 4 ▁Bo om ▁town ▁community ▁of ▁Best ▁pl ung es ▁into ▁vice ▁and ▁violence , ▁necess it ating ▁the ▁Texas ▁R angers ▁inter vention . ▁The ▁R angers ▁destroy ▁buildings ▁that ▁are ▁being ▁used ▁as ▁bro th els , ▁g amb ling ▁houses , ▁and ▁sal o ons . ▁ 1 9 2 5 ▁V ot ers ▁move ▁the ▁county ▁seat ▁to ▁Big ▁Lake . ▁ 1 9 2 6 ▁Tex on ▁is ▁established ▁by