Why can't we have paid Maternity Leave?

Diana • 37 mom of 2! I teach music, love reading, cooking, baking, and being with my family.
Is anyone else mad that we don't get paid maternity leave? This is my third baby and both times my husband and I have chosen to leave one of our careers to care for our baby rather than use day care. We are fortunate to have family to take us in to save on housing but...we are so tired of that choice: baby or job? I'm a teacher and my supervisors are not sympathetic about my desire to take 11 weeks and then requesting breaks for pumping upon my return. What an uphill battle!