These three sentences are key words for "may well be  or are illegally present."  They are worded pretty much exactly how the illegal alien unaccompanied minor's word their reason for their illegal entry and their family reunifications here.
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Sentence # 1 Many students’ parents fled oppressive governments and wars...

Sentence # 2 -Berety’s mother fled Sierra Leone during a civil war while she was pregnant with Berety...  

Sentence # 3 -Berety’s mother finally reunited with her parents, who eventually moved the family to the United States...