I went to school in New York, looks like they stopped the "Silent Moment, Pledge of Allegiance" about the same time down here also when my kids were in school.
Those things were decided by the Supreme Court, ironsides. I think in 1964 your Supreme Court declared school prayer to be unconstitutional. Then many states substituted moment of silence for school prayer. But courts struck down the moment of silence as well.
When Supreme Court rules on something that is the final word on the subject, short of a constitutional amendment.