Final answer:
The exact number of schools and institutions the Brothers grew into by 1859 is not supplied, but by the 1860s and 1870s, there was significant growth in educational opportunities for African Americans, indicating extensive development in education for freed slaves after the Civil War.
Step-by-step explanation:
The question refers to the growth of educational institutions for African Americans by 1859. While specific numbers for that exact year are not provided, historical records indicate a significant expansion of educational opportunities post-Civil War. By 1869, over 9,500 teachers were operating in Freedmen's schools. By 1870, the Freedmen's Bureau had set up 4,329 schools with an enrollment of 247,000 students, indicating substantial educational development for African Americans in the post-Civil War era.
Further educational progress is exemplified by the foundation of institutes such as the Institute for Colored Youth and colleges like Oberlin and Berea, which were amongst the few offering higher education to African Americans. The emphasis on schooling was so profound that Freedpeople would attend classes in any available space, demonstrating a whole race's commitment to education.