The 'burden of proof' is on the plaintiff, since the defendant is presumed innocent until proven guilty. [=the plaintiff must prove that the defendant is guilty]
The 'tax burden' has been falling increasingly on the middle class. [=middle class people have been paying a greater portion of taxes]
For the rest of his life he 'was burdened' with the knowledge that he had done nothing to help them.
(..) These are great matters! All of it! One day you may be King. I hope so with all my heart. And yet, I know its burdens. They're very real, like forever dragging a stone up a hill, only to watch it perpetually roll back down again. (..)2017 TvShow: Vikings Title: The Great Army Season: 4 Episode 17