U.S. officials are scrambling to handle a dramatic spike in children crossing the U.S.-Mexico border alone. It’s lead to a massive expansion in emergency facilities to house them as more kids arrive than can be released to close relatives in the United States. Advocates and former U.S. officials say the government failed to prepare for a big increase in children traveling alone as President Joe Biden ended some of his predecessor’s hardline immigration policies and decided that unaccompanied kids wouldn’t be expelled from the country like the Trump administration did for eight months. So many children are coming that there’s little room in long-term care facilities, where capacity shrank during the coronavirus pandemic.