Annexation

When the development of Rosemont began, it was part of Arlington County (which was itself known as Alexandria County until 1920). In 1915, Alexandria annexed Rosemont along with other territory then known as the “west end”; at the time Rosemont was described to be generally supportive of annexation, since its residents “attend the churches, places of amusement, participate in the social life of the city, and are practically, as closely connected with the city life as are the people residing within the city’s boundaries.”