Sentence:  That such expansion can be obtained without a raise in taxes is due to growth of the tax digest and sound fiscal planning on the part of the board of commissioners , headed by Chairman Charles O. Emmerich who is <WSD>demonstrating</WSD> that the public trust he was given was well placed , and other county officials . 
Meaning of the word marked with <WSD> tags:  establish the validity of something, as by an example, explanation or experiment