Textbook Agenda

I’m not suggesting that textbooks in this country are biased and driven by a political agenda, but I’m looking for another satisfactory explanation for the following definitions in a textbook I’ve been given to teach history.

Socialism: movement to make the country fully democratic, with equal rights for everyone

Left-wing: believing that society should be made more equal

Right-wing: believing that the country should be strong and that ordinary people should have little or no power

Why, how could I think that somebody (like author Andrew Boxer) has a “Left-wing good/Right-wing bad” or “Socialism good/Capitalism bad” message they are trying to get across to 14- to 16-year-olds? Of course he never comes out directly and says it. He doesn’t need to, really.