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.
(..) them, we promise. And in the end, we assemble an army twice the size of the army our father took to Paris. And we declare war on England. No. In the name of our dead father, in the name of Ragnar Lothbrok, the greatest hero of our country, and in the name of Odin, we declare war on the whole world. Frankia. Home? I don't know. Difficult to return. (..)2017 TvShow: Vikings Title: The Great Army Season: 4 Episode 17