Maria Cabrini was determined from her childhood to make religious work her life's vocation. After teaching in Italy in Vidardo (1872–74), she was appointed supervisor of an orphanage in Codogno (1874). In 1877 she took her vows and soon after became known as Mother Cabrini. She founded (1880) the Missionary Sisters of the Sacred Heart. She planned to found a convent in China, but Pope Leo XIII (Leo XIII) directed her to “go west, not east,” and she sailed with a small group of sisters for the United States in 1889. Their work in the United States was to be concentrated among the neglected Italian immigrants. This journey was the first in a series that took her through the Americas and into Europe. She became a naturalized citizen of the United States in 1909. Although plagued by ill health most of the time, Mother Cabrini established 67 houses—one for each year of her life—in such cities as Buenos Aires, Paris, Madrid, and Rio de Janeiro. She also founded several schools, hospitals, and orphanages.