Kammala wannan jumla: Ba da daɗewa ba dangin Ortiz de Rozas, ɗaya daga cikin masu mallakar ƙasa mafi kyau a Argentina, suka sayi yankin da ke bakin teku. An sayar wa wata sananniyar iyali, Leloirs, a shekara ta 1816, yankin ya zama gonar tumaki. Wani zuriyar Ortiz de Rozas, Janar Juan Manuel de Rosas, ya sanya yankin a cikin gundumar lardin Buenos Aires a 1825, yanki na farko da aka ba shi tun lokacin da aka sami 'yancin kai a 1816; a matsayin gwamna, Rosas ya murkushe tashin hankali na gida a 1839 a kan mulkinsa na zalunci. Bin Rosas'
Bayan juyin mulkin 1852, an ba da yankin a matsayin wurin zama na gundumar (Mar del Tuyú) a cikin 1864 kuma, tare da isowar wuraren yanka, gwamnati tana da tashoshin masunta, tashar ruwa tsakanin San Clemente da Buenos Aires, wani layin dogo da fitilu biyu da aka gina tsakanin 1878 da 1902.