Four Mile Law
From Tennessee Encyclopedia:
Anti-liquor groups in Tennessee had more success forbidding the sale of liquor near the premises of schools, hospitals, and churches. The first such law, passed in 1824, restricted liquor sales near churches. In 1877 the legislature enacted a law forbidding the sale of alcohol within four miles of chartered rural schools. In 1887, while attention was focused on a prohibition amendment to the state constitution, the legislature amended the Four-Mile Law to prohibit the sale of intoxicating liquors within four miles of any country school, virtually banning the liquor business in rural Tennessee.