People who try to get their arms around California inevitably have trouble. The place is too large, diverse, and complex; it isn't really one place at all, except maybe in the minds of outsiders. So it's not surprising that Made in California: Art, Image, and Identity, 1900-2000, the monumentally ambitious and grandly titled show that runs through February 25 at the Los Angeles County Museum of Art (LACMA), would run into equally monumental difficulties. Even as cultural history, which is what it's intended to be, it struggles.