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.
(..) go free. I don't know. Nobody really can. But we have a reasonable doubt. And that's something that's very valuable in our system. No jury can declare a man guilty unless it's sure. We nine can't understand how you three are still so sure. - Maybe you can tell us. - I'll try. (..)1957 12 Angry Men
(..) would blow his stack. He was just tryin' to bait me. He did an excellent job. I think we're going nowhere here. I'm ready to walk into court and declare a hung jury. - There's no point in this thing going on. - I go for that, too. Let the kid take his chance with other guys. (..)1957 12 Angry Men