More than 100 years ago, Montana and many states erected legal walls against spending public money on private religious schools, but today school choice activists are seeking to bring down those barriers using a case from Montana.

The U.S. Supreme Court will hear oral arguments Wednesday in a lawsuit brought on behalf of Kendra Espinoza and two other Kalispell-area mothers whose children attend Stillwater Christian School.

Montana is among 37 states that have provisions in their state constitutions that bar religious schools from receiving state aid.