The title probably should read “What the Year 1900 thought of the Year 2000” but that seemed too bulky for a title. It also gave an even weirder impression that a year can have thoughts about another year. Not true.
No, what I’m talking about is predictions made by Ladies Home Journal in December 1900 about what ‘they’ thought the world would be like like in a century’s time, i.e. 2000. It’s fascinating stuff really. You should read it. The article explains things far better than I can.