In what century were oil field discovered in the arabian peninsula

Well, the answer you are looking for is going to be the 20th century. this is going to be because back then the need for oil had been really high because it was needed for things like running machines or maybe even cars. If the oil field had not been discovered places like The U.S.A would have been short on oil and the prices would go up on oil.

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1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.