Lilís's dictatorship was dependent upon heavy borrowing from European and American banks to enrich himself, stabilize the existing debt, strengthen the bribe system, pay for the army, finance infrastructural development and help set up sugar mills. However, sugar prices underwent a steep decline in the last two decades of the 19th century. When the Westendorp Co. went bankrupt in 1893, he was forced to mortgage the nation's customs fees, the main source of government revenues, to a New York financial firm called the San Domingo Improvement Co. (SDIC), which took over its railroad contracts and the claims of its European bondholders in exchange for two loans, one of $1.2 million and the other of £2 million. As the growing public debt made it impossible to maintain his political machine, Heureaux relied on secret loans from the SDIC, sugar planters and local merchants. In 1897, with his government virtually bankrupt, Lilís printed five million uninsured pesos, known as "papeletas de Lilís", ruining most Dominican merchants and inspiring a conspiracy that ended in his death. In 1899, when Lilís was assassinated by the Cibao tobacco merchants whom he had been begging for a loan, the national debt was over $35 million, fifteen times the annual budget.