Unlike most developed countries in the world, the United States does not have nationalized health insurance. Rather, health insurance is largely provided by the private sector in the U.S. with national health insurance for certain segments of the population, namely the elderly (Medicare) and poor (Medicaid). One of the concerns of many Americans with this approach is that there is a segment of the population that remains uninsured. Many of these uninsured earn too much to qualify for Medicaid and too little to afford private insurance. Of particular concern to many is that a large percentage of the uninsured are children. In an attempt to address this particular problem, Medicaid rules have been changed over the last several years to allow more children to qualify for insurance.