This reviews an interesting book
"To the Flag: The Unlikely History of the Pledge of Allegiance" by Richard J. Ellis
University Press of Kansas, 297 pp., $29.95. Here are a couple paragraphs from the article, more at site, including which state make it mandatory for public school children to say it (WA, "Feb 1919, same month as the Seattle general strike, which had spread fears of a communist takeover"). The more we can learn about the past, the better we are able to work with it, and I am going to see if I can get our library to order one of these.
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The Pledge of Allegiance was promoted for decades before any government adopted it. It was not even the only flag oath; others had their day and died. The pledge achieved immortality by achieving a critical momentum when Americans were worried about war, immigration and radicalism.
The story is told in "To the Flag" by Richard Ellis, professor of history at Willamette University. He approaches his topic with probably as much objectivity as anyone could.
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Other states mandated the pledge in the 1920s, and legal battles began over it. One of the harshest fates befell a 9-year-old Bellingham boy, Russell Tremain. Following his parents' religious faith, the boy refused to say the pledge, and in 1925 was expelled from public school. When the family did not back down, a judge ordered the boy put in a state home. The state kept him for more than two years, forbade his parents to visit him and began the process of putting him up for adoption. In November 1927 a different judge restored him to his parents, who sent him to a private school.
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The book also contains the story of the two times the pledge was changed. Both had to do with radicalism.
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Toward the end of the book comes the story of how the pledge became a weapon of the Republicans in the 1988 campaign of George H.W. Bush.
http://seattletimes.nwsource.com/html/artsentertainment/2002334741_pledge14.html