PARIS — In the small northern Croatian town of Orehovica, preschoolers get together twice a week to play and learn. The classes, which include children of Roma background, are full of energy.

PARIS — At the Fourth World Conference on Women in Beijing in 1995, participants promised to advance the rights of women and girls everywhere. Part of that promise, set out in the historic Beijing Declaration and Platform for Action, was to ensure education for all girls.