The company was forced to 'declare bankruptcy'. [=to formally say in a legal document that it was bankrupt]
He 'declared' himself the winner. = He 'declared' that he was the winner. = He 'declared victory'.
His 'declared' [=publicly stated] aim/goal/intention is to improve the city's downtown area.
(..) mourned the good King Edwin... who by the cruel Viking Ragnar was foully murdered... and still lies unrevenged. The council of the kingdom now declare that Aella... is of the true royal line... and welcome his succession to the throne. Your Majesty. Thank you, my gracious lady. (..)1958 The Vikings