The decline of the West is when people from the Western countries, such as the United States, Europe, and other places that are considered part of the West, no longer have as much power or influence over the world as they used to. It means that countries from other parts of the world are becoming more powerful and increasingly important in the global economy and in global affairs. This is happening because more of the world's population is living in countries that are not in the West, like China, India, and many parts of Africa, and these countries are growing and becoming richer. The decline of the West means that Western countries are not as powerful or influential in the world anymore.