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.
(..) Because my lord Beowulf is a mighty hero, and because he killed the demon Grendel, and laid it's mother in her grave. -To Beowulf! and because I have no heir... I have no sons, I declare that on my death, all that I possess, my kingdom, my hall of sadness and shame, and even my lovely young queen, (..)2007 Beowulf