The place that is changing because of immigration, often be for many reasons, including :
Education, sedentary lifestyle, working
One theory of immigration distinguishes between Push and Pull.[7] Push factors refer primarily the motive for emigration from the country of origin. In the case of economic migration (usually labor migration), differentials in wage rates are usual. If the value of wages in the new country surpasses the value of wages in one’s native country, he or she may choose to migrate as long as the costs are not too high. Particularly in the 19th century, economic expansion of the U.S. increased immigrant flow, and in effect, nearly 20% of the population was foreign born versus today’s values of 10%, making up a significant amount of the labor force. Poor individuals from less developed countries can have far higher standards of living in developed countries than in their originating countries. The cost of emigration, which includes both the explicit costs, the ticket price, and the implicit cost, lost work time and loss of community ties, also play a major role in the pull of emigrants away from improved, travel time and costs decreased dramatically between the 18th and early 20th century. Travel across the Atlantic used to take up to 5 weeks in the 18th century, but around the time of the 20th century it took a mere 8 days.[8] When the opportunity cost is lower, the immigration rates tend to be higher.[8] Escape from poverty (personal or for relatives staying behind) is a traditional push factor, the availability of jobs is the related pull factor. Natural disasters can amplify poverty-driven migration flows. This kind of migration may be illegal immigration in the destination country (emigration is also illegal in some countries, such as North Korea, Myanmar, and Cuba).