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 mean, we need a gifted programmer who's creative. And we know that you've been taking it in the shins. Women's groups are ready to declare a fatwa. But, you know, this could help rehabilitate your image. Wow. You would do that for me? We'd like to work with you. Our first programmer graduated (..)2010 The Social Network