The movement of people within the boundaries of a single nation-state constitutes a significant demographic process. This population shift involves relocation from one area to another within the same country, often in pursuit of improved economic opportunities, enhanced social amenities, or a more desirable living environment. For instance, individuals may move from rural areas to urban centers seeking employment, or from economically depressed regions to more prosperous ones. These movements are differentiated from international movements which involve crossing an international border.
Such demographic shifts play a crucial role in shaping the economic, social, and cultural landscape of a nation. They can contribute to regional disparities in wealth and development, influence the distribution of political power, and impact the provision of public services. Historically, these movements have been driven by factors such as industrialization, agricultural changes, and natural disasters, leading to profound changes in settlement patterns and population densities across geographic regions.