A country has a limited number of jobs or services
Explanation:
A country may decide to limit immigration to protect it's citizens. In other words, considering the limited number of jobs and services available to the citizens, a country in trying to protect the citizens may have to guard against quick depletion of its resources in the form of jobs or services by aiming to serve the population of its citizens and not increasing pressure in resources by allowing more immigration. Example the case in the United States where the president may try to limit immigration to make for more jobs for Americans
