VTWO - Is The Ballooning U.S. Government Debt Sustainable? January, 23 2021 12:58 PM Vanguard Russell 2000 Index Fund Two factors that make the U.S. federal debt more sustainable in the short-term. Are U.S. corporate tax increases possible this year? Is Europe at risk of another recession? For further details see: Is The Ballooning U.S. Government Debt Sustainable?