Instead of going all ape-shit and complaining that the Texas School Board is re-writing history for all of the US, boycott those texts and go for something more balanced. You don't *have* to buy those textbooks, you shouldn't sacrifice quality education just to save money. The texts used by Texas public schools have such a large influence on other states' curricula because they all buy those texts, so all those consumers are partly to blame for Texas's influence. If you don't like what they're putting out, you don't have to buy it. If the Texas School Board feels that education in Texas should be taught a certain way, that's their prerogative (insofar as what kind of powers were given to them when they were elected/appointed to the board).
To sum up, Texas School Board can "screw over" the education in Texas if they want. Everyone else can choose whether or not to follow suit. Texas is not responsible for the curriculum in California, and they're actually taking that to heart.