What’s the “message” behind the picture, “An illustration of immigrants on the steerage deck of an ocean steamer passing the Statue of Liberty”?

About 14 million immigrants entered the United States through New York between 1886 and 1924. To them, seeing Liberty's Statue signified their arrival in the country of their hopes. It was not "enlightenment" as intended by her designers, but rather "welcome" to these nervous visitors that the Statue's raised torch suggested. The "Mother of Exiles," Liberty, became a symbol of hope for generations of immigrants as time passed.

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the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).