sentences:  The yet unincorporated communities on the Izu (previously part of Shizuoka) and Ogasawara (previously directly Home Ministry-administrated) island groups became also part of Tokyo in the 19th century.When the modern municipalities – [district-independent] cities and [rural] districts containing towns and villages – were introduced under the Yamagata-Mosse laws on local government and the simultaneous Great Meiji merger was performed in 1889, the 15 "-ku" became wards of Tokyo City, initially Tokyo's only independent city "(-shi)", the six rural districts of Tokyo were consolidated in 85 towns and villages.In 1893, the three Tama districts and their 91 towns and villages became part of Tokyo.