School vouchers are a taxpayer swindle that fails to raise achievement while eroding public schools and the principle of equal protection under the law outlined in the U.S. Constitution. If more states adopt school voucher systems, most parents will find their top choice — a neighborhood public school — largely defunded and unable to recruit and retain high-quality teachers due to a transfer of funds into unregulated private schools. Americans from all backgrounds have fought to gain access to public schools, including freed slaves, immigrants and people with disabilities. These struggles have led to a free universal public education system...