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In page Tocantins:

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Before 1988 the area made up the northern two-fifths or one-third of Goiás state.[2] Since the 17th century, this area was relatively isolated by rivers navigable only in short portions and mountains, and difficult to access. As a result, the southern area of the state became more developed, particularly after this area was selected in 1956 as the site for the development of the new capital of Brasília and the Federal District.[2] A strong separatist movement developed in the north for independence of its people.[citation needed]