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At daybreak , U . S . troops pushed through the outskirts of Karbala on the road to Baghdad , capturing a key bridge on the Euphrates River .
 U . S, Karbala, Baghdad, U . S . troops, the road to Baghdad, a key bridge on the Euphrates River, the outskirts of Karbala, the Euphrates River
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 U . S, Karbala, Baghdad, U . S . troops, the road to Baghdad, a key bridge on the Euphrates River, the outskirts of Karbala, the Euphrates River