generate questions: Since the 1920s, motion pictures, petroleum and aircraft manufacturing have been major industries. In one of the richest agricultural regions in the U.S., cattle and citrus were major industries until farmlands were turned into suburbs. Although military spending cutbacks have had an impact, aerospace continues to be a major factor.
Motion pictures, petroleum and aircraft manufacturing have been major industries since which decade? {sep_token} What characteristic best describes the agricultural regions that could be found? {sep_token} Outside of livestock, what else was considered a major industry in the agriculture regions? {sep_token} Which type of livestock was the argricultural region known for? {sep_token} What industry has managed to survive major military spending cutbacks?