Full-service financial firms provide a wide variety of comprehensive financial services, including retail and commercial banking, insurance, and investment banking, etc. In the past 90 years, the regulatory barrier to the creation of full-service financial firms in the U.S. has changed dramatically. What are the major laws in U.S. that prevented or promoted the establishment of full- service financial firms? Briefly describe the main content of each of those laws. (20 points) 16:47