The monroe doctrine of 1823 warned europe to stay out of the americas, and the u. s. would stay out of european affairs. why was this foreign policy effective, and why did europe accept it? a. it benefited great britain, and the british navy enforce it. b. france and italy were afraid of american expansion into europe. c. constant fighting had weakened the european countries. d. european countries had already divided up all of the new world.

Migration the ability to meet current needs without reducing the ability to meet future needs 2. immigration the leaving of one's homeland to settle in a new place 3. migration a situation in which the birth rate is not sufficient to replace the existing population 4. overpopulation the movement of people to a new country 5. sustainable development the increase in the population of a city 6. underpopulation a situation in which resources are being used up at a faster rate than they can be replenished 7. unsustainable development a situation in which the number of people exceeds the available natural resources in an area 8. urbanization the movement of people from one place to another