sentences:  A Buenos Aires-Pacific Railway line was built along the town in 1870, and its first schools were opened at that time as part of President Domingo Sarmiento's program for education in Argentina.The town was designated as county seat for the newly created "General Sarmiento Partido" in 1889, and was in turn made the county seat for San Miguel Partido when the former was subdivided in 1994.San Miguel's transition from a rural community to that of a suburban bedroom community with high-rise buildings has caused it to lose its village character and strained its infrastructure.