@indigomoth - The thing about mergers and acquisitions though is that they often result in people being fired, just because it's difficult to completely run a new company without installing some of your own people.
This probably isn't as much of a problem with international mergers, but I'm sure it still happens. Particularly if the company being acquired was in financial trouble. I think they will often fire people just to look like they are being proactive!
So, while it can be a good thing, it is not universally good for the employees. Unfortunately, it is often a very stressful and uncertain time, as I know from experience.