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.
(..) It was a mad house. A greed fest, with equal parts, cocaine, testoterone and body fluids. Yeah! It got so bad, I had to declare the office a fuck free zone between the hours of and . But I'm counting even that didn't enough. Actually the madness started on our very first day. (..)2013 The Wolf of Wall Street