A trade crossroads dating back to Native American times, Santa Clarita may be relatively new in the story of Los Angeles County's suburban sprawl, but old-timers also recall it as the "Navel of the Universe." A Chinese general once declared the Santa Clarita Valley one of the top 10 military targets on Earth. Located east of the Ventura County line where the valley creates a break in the Angeles National Forest, Santa Clarita has been home to cowboys,...