How did Empress Marie Theresa die?

Empress Maria Theresa of Austria died on November 29, 1780, at the age of 63. Her decline in health was gradual, with her passing attributed to a combination of pneumonia and other ailments related to her advanced age. She had ruled for 40 years and was deeply involved in the governance of her empire until her final days. Her death marked the end of an era, as she was a significant figure in European history.