1: Since their young son 's disappearance , the Patzes have worked to keep the case alive and to create awareness of missing children in the United States . 2: In the early 1980s , Etan 's photo appeared on milk cartons across the country , and news media focused in on the search for him and other missing children . 3: Etan Patz disappeared in 1979 ; his face appeared on milk cartons all across the United States .
1: the United States 2: the country 3: the United States