Just some interesting tidbits about how unions and high taxes drive out businesses.
It's not so simple. The Canadian fiasco, in my opinion, wasn't about unionism. It was widely written that the Canadian division was purchased for some patents and technology, not for the facility it's self. Caterpillar proceeded to demand an approximately 50% reduction in pay for skilled labor. They even had job fairs trying to attract a replacement work force at the newer rates and weren't able to attract skilled labor for the high school wages they proposed. They than used that as a pretext to shutter (and relocate) it, which is what was widely considered to be one of their initial goals to begin with.
As for Illinois, they've had a vicious battle going with the state for awhile now, with a lot of political stabbing going back and forth. Hence we see the continuation of that with how much the president of Caterpillar goes out of his way to snub the state, when ever given the chance.