The number of migrant children living in Texas shelters has fallen to its lowest point in two years, a dramatic change after a hardline but short-lived federal immigration policy last year overwhelmed the state’s shelter network and led thousands of children to linger for extended periods in temporary shelters. These shelters are where some unaccompanied minors go after leaving temporary U.S. Customs and Border Protection facilities if officials cannot find U.S.-based sponsors to take them in. Most are run by private contractors, paid for by the U.S. Department of Health and Human Services and regulated by the state. Shelters are meant ...