[atheonard]

I don't remember who said it, but usually there's four requirements that makes a city a "global city": 1. a strong multinational corporate presence, 2. multicultural presence of peoples from different regions within the country and other nations, 3. a prestige based on the concentration of artistic and scientific elites, 4. significant international tourism or sometimes the criteria can be judged by its political, economic, cultural and infrastructural characteristics.
A few examples of "global city"=London, New York, and Tokyo.

I can think of some reasons as to why Sacramento should want to. Like I said Sacramento is the capital of California, the 6th largest economy in the world. It should be at least playing in the same global stage as Los Angeles or San Francisco, shouldn't be content being a second tier city overshadowed by San Francisco. So I think the main reason is to attain prestige, or status?

I'm not too sure as to specific steps. Perhaps start by attracting big investors?