, ▁ 1 9 4 6 ) ▁was ▁an ▁American ▁public ▁health ▁official ▁and ▁professor ▁who ▁was ▁influ ential ▁in ▁the ▁early ▁tw enti eth ▁century . ▁ ▁Early ▁life ▁▁ ▁Mil ton ▁Joseph ▁Rosen au ▁was ▁born ▁in ▁ 1 8 6 9 ▁in ▁Philadelphia , ▁Pennsylvania , ▁to ▁Nathan ▁Rosen au ▁and ▁Math ilde ▁Bl itz , ▁German ▁Jewish ▁em igr ants . ▁After ▁obtain ing ▁his ▁degree ▁from ▁the ▁University ▁of ▁Pennsylvania ▁in ▁ 1 8 8 9 , ▁he ▁joined ▁the ▁United ▁States ▁Marine ▁Hospital ▁Service . ▁After ▁working ▁for ▁a ▁few ▁years ▁under ▁the ▁super vision ▁of ▁ ▁Dr . ▁Joseph ▁K iny oun , ▁Rosen au ▁began ▁his ▁as cent ▁into ▁positions ▁of ▁greater ▁authority . ▁ ▁Camp ▁Jen ner ▁▁ ▁Having ▁been ▁promised ▁land ▁by ▁the ▁Mexico - based ▁T la hu ial ila ▁Company , ▁about ▁one ▁thousand ▁African ▁Americans ▁migr ated ▁across ▁the ▁Texas ▁Mexican ▁border . ▁After ▁finding ▁conditions ▁there ▁far ▁worse ▁than ▁what ▁they ▁had ▁been ▁promised , ▁most ▁decided ▁to ▁migr ate ▁back ▁to ▁the ▁United ▁States . ▁In ▁returning ▁and ▁crossing ▁the ▁border ▁through ▁E agle ▁Pass , ▁they ▁brought ▁back ▁with ▁them ▁a ▁small po x ▁ep ide mic . ▁This ▁caused ▁a ▁health ▁crisis ▁at ▁the ▁border . ▁Un wel come ▁amongst ▁the ▁inhabitants ▁of ▁E agle ▁Pass , ▁the ▁three ▁hundred ▁or ▁so ▁migr ants ▁were ▁placed ▁in ▁a ▁distant ▁and ▁ill - c ared ▁for ▁camp ▁just ▁north ▁of ▁the ▁Rio ▁Grande ▁River . ▁After ▁Texas