There were 2 main ideas proposed on what to do with slaves if they were freed. Theses were integrated and A-Relocation to Canada or B-Colonization

Ithink it is oesteoprosis

True blindness may be caused by trauma to the eye, severe conjunctivitis due to  ibr (infectious bovine rhinoceros) or pink eye or other infections, leptospirosis, lead poisoning, selenium toxicity, fungal infections, vitamin a  deficiencies, rabies, vitamin b12 deficiency, neoplastic of the orbit or  conjunctiva, cataracts, congenital malformations, etc.