What type of schools were established in Lexington, Massachusetts in 1839 for teacher training?

The establishment of normal schools in Lexington, Massachusetts in 1839 was a significant development in the history of teacher education. Normal schools were specifically designed to train prospective teachers in the methods and principles of education. The term "normal" referred to the idea of setting a 'norm' or standard for teacher education.

These institutions focused on not only the academic content but also on pedagogical skills, enabling teachers to learn effective instructional practices. The development of normal schools marked a shift towards a more formalized and systematic approach to teacher training, which was seen as essential for improving the quality of education in public schools. Over time, many normal schools evolved into what we now recognize as colleges and universities that specialize in education.

In contrast, charter schools are independently run public schools established through a charter, technical schools focus on vocational training for specific trades, and private academies are fee-based schools that may have varied curricula. Hence, the correct answer highlights the establishment of a dedicated educational institution aimed at teacher preparation in Massachusetts.