ANTHONY — A tall chain-link fence splits the preschool campus behind Anthony Elementary in southern New Mexico: federally funded classrooms on one side, state-funded classrooms on the other. The fence serves as a literal and symbolic divide segregating two sets of classrooms outfitted with the same child-size tables, chairs and toys; two sets of highly trained teachers; two separate playgrounds — and a bitter competition for 4-year-old children. As New Mexico has expanded early education for toddlers over the past decade, the state has created a system that bars providers from mixing state and federal funds in the same classroom. It’s a policy – not a law – that effectively separates kids into rival programs, often divided by income. Head Start serves the lowest income families in New Mexico; the state programs serve families from a range of income levels.