Children won a big victory in Nevada on Thursday as the state Supreme Court upheld the state’s revolutionary education savings accounts (ESAs), the nation’s first universal school choice program. Note to Donald Trump: This is worth celebrating.

ESAs allow parents who withdraw their kids from public schools to use state funds to pay for private school tuition, tutoring, curriculum and school supplies. Each account in Nevada is funded at 90% to 100% (more for low-income and disabled kids) of the average statewide per pupil expenditure....