Many young people born in the United States have parents and/or grandparents who hold allegiance to another country. Due to their own "natural born" status these young people have never taken an oath of allegiance to the United States. They have been raised with a divided allegiance.
Such an oath should also include an acknowledgment of the meaning of treason to make it hit home.
"Whoever, owing allegiance to the United States, levies war against them or adheres to their enemies, giving them aid and comfort within the United States or elsewhere, is guilty of treason and shall suffer death, or shall be imprisoned not less than five years and fined under this title but not less than $10,000; and shall be incapable of holding any office under the United States."