1800s: Power struggles Turns out it's not easy to shoo federal bureaucrats away from the piggy bank.
When they wanted to spend more than Congress gave, the War Department and other agencies ordered stuff on credit. Then they would go to Congress seeking an appropriation to pay the bills. Lawmakers felt obliged to cover the government's debts, but they weren't happy about it. The executive branch was undermining Congress's power of the purse.
Congress responded with a series of laws that eventually got one of those dreadful Washington monikers: the Anti-Deficiency Act.
Because of the act, officials who mistakenly spend money Congress hasn't OK'd face disciplinary action, ranging from firing to hours stuck in mind-numbing budget training. There are exceptions for spending to protect lives or property.
But willful overspending is a crime that carries the threat of fines and two years in prison.