Arthur reported to the Colonial Office secretary in London that the Aboriginal people "already complained that the white people have taken possession of their country, encroached upon their hunting grounds, and destroyed their natural food, the kangaroo" and in a memo he proposed settling the Aboriginal people "in some remote quarter of the island, which should be reserved strictly for them, and to supply them with food and clothing, and afford them protection ... on condition of their confining themselves peaceably to certain limits". He said Tasmania's northeast coast was the preferred location for such a reserve and suggested they remain there "until their habits shall become more civilised". He pursued the proposal by issuing on 19 April 1828 a "Proclamation Separating the Aborigines from the White Inhabitants" that divided the island into two parts to regulate and restrict contact between blacks and whites. The northeast region was an area traditionally visited by many groups for its rich food reserves, and rivers, estuaries and sheltered bays as well as its mild climate. It was also largely unoccupied by colonists. But the proclamation partitioning the island also provided the first official sanction of the use of force to expel any Aboriginal people from the Settled Districts. Historian James Boyce observed: "Any Aborigine could now be legally killed for doing no more than crossing an unmarked border that the government did not even bother to define."