Final answer:
Louis XIV's actions weakened the French economy through extravagant spending and providing financial aid during the American Revolution.
Step-by-step explanation:
One of Louis XIV's actions that weakened the French economy was his extravagant spending, particularly on the Palace of Versailles. The opulent lifestyle of the king and the construction of the palace placed a heavy financial burden on the country. Additionally, providing financial aid to colonists during the American Revolution further added to the massive debt of France.