The significant changes on Wall Street and the New York Stock Exchange from 1971 to the start of the twenty-first centuries were primarily because of less regulation, new technologies, and new business ways. There were many times when the government loosened rules about money throughout the 1980s and 1990s. As an example, the Glass-Steagall Act was repealed in 1999. This law has kept investment banking and commercial banking apart. This transformation caused big, strong banks to grow and more people to trade in the market, which made it easier for financial services to work together. Trade has changed because of new technologies like computers and computerized trading platforms. These changes have made trade faster and more efficient. Banks in the United States grew their businesses worldwide, and Wall Street became more tied to the world's financial markets. The stock market crash of 1987 and the dot-com bubble are fantastic examples of how deregulation made the market more unstable and dangerous. Even with these issues, Wall Street stayed the center of global finance. This helped the economy flourish and revolutionized banks and other financial organizations worldwide.