How to Pay off Debt??

After winning the civil war I took on the previous debt which made my debt to GDP ratio go from like 10% to 466%. My factory output is now zero. How can i even begin to combat this, there's not a good save i can load

After winning the civil war I took on the previous debt which made my debt to GDP ratio go from like 10% to 466%. My factory output is now zero. How can i even begin to combat this, there's not a good save i can load