By marrying the heir to the throne, who 4 years later became Louis XVI. She herself was the daughter of the Holy Roman Empress and Archduchess of Austria, so she was by far the most suitable bride.
By marrying the crownprince of France (Louis XVI) who eventually became King (which made her Queen).She was an Austrian Archduchesse (prinsess) and her mother (the empress of Austria) had made a...
Maria Theresa of Austria wanted to form an alliance with France, so she had her youngest daughter, Marie Antonia (Marie Antoinette), to marry Louis-Auguste, the Dauphin of France or Louis XVI.