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How did Marie-Antoinette's marriage to Louis XVI support the Austro-French alliance?

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Stone ruins of Habsburg Castle, also known as Habichtsburg, stand on a hill above green vineyards in Aargau canton, Switzerland, with a flag flying atop the tower. — House of Habsburg Ruins of the castle of Habsburg, or Habichtsburg (“Hawk's Castle”), built 1020, the original seat of the house of Habsburg, Aargau canton, Switzerland.

The marriage of Marie-Antoinette to the future King Louis XVI in 1770 was a calculated diplomatic maneuver designed to solidify the Austro-French alliance, a strategic shift known as the Diplomatic Revolution.1

Following the Seven Years’ War, the Habsburg empress Maria Theresa sought to move beyond the traditional rivalry between the House of Habsburg and the Bourbon monarchy of France. By marrying her daughter, Marie-Antoinette, to the dauphin Louis, Maria Theresa aimed to cement this new partnership and secure French support for Austrian interests on the European continent.123

Despite the marriage, the alliance remained complex and often unpopular in France, where many viewed the Austrian connection with suspicion. Marie-Antoinette herself was frequently treated as a political pawn, and her efforts to influence French foreign policy in favor of her brother, Emperor Joseph II, were often met with resistance from French officials, including Louis XVI and his ministers.2