Being a working parent is relatively tough in the United States, thanks to a lack of policies guaranteeing flexibility, paid leave and affordable childcare. But the White House is aiming to change that this year with major policy summit on Monday and a months-long, multidimensional campaign to elevate the conversation about how federal policy can help parents juggle the demands of life and work. The U.S. is one of only three countries in the world, along with Papa New Guinea and Oman, lacking guaranteed paid maternity leave for working moms, according to the United Nations. Most developed countries require employers to provide some amount of paid maternity or paternity leave, paid family and sick leave, and affordable early childhood education for their workers. The U.S. lags significantly behind other developed countries in all of these areas. As a result, a relatively low percentage of women participate in the workforce. In 1990, the U.S. had the sixth-highest female labor participation rate among 22 of the world’s wealthiest countries. Today, the U.S. ranks 17th. ….