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.
(..) I didn't know what the heck you wanted me to do. Behold the Underminer! I am always beneath you, but nothing is beneath me! I hereby declare war on peace and happiness! Soon all will tremble before me! (..)2004 The Incredibles