Why did French government spending rise sharply between 1620 and 1640?

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Between 1620 and 1640, French government spending tripled primarily due to the ambitious and expensive foreign policy pursued by Cardinal Richelieu on behalf of Louis XIII.12

During this period, two-thirds of all government expenditure was directed toward the military. Richelieu sought to secure France's frontiers and undermine the power of the Habsburgs by involving the country in the Thirty Years’ War and the War of the Mantuan Succession. These efforts included paying significant subsidies to foreign allies, such as the one million livres per year promised to Gustav II Adolf of Sweden under the Treaty of BĂ€rwalde in 1631, and eventually committing France to direct conflict with the Habsburgs in 1635.12

To fund these military endeavors, the crown drastically increased taxes, which placed a heavy burden on the population and sparked a series of provincial rebellions throughout the 1630s.12