What should i subtract when trying to find the natural increase of a country

Birth rate – Death rate = natural increase

Natural increase +or- net migration

Explanation:

Birth rates are the amount of birth per 1000 people and death rates are the number of deaths per 1000 people. If there is more birth than deaths the population is increasing naturally. If there are more deaths then the population will be decreasing. However, migration plays an important role. The next migration is calculated by taking into account the number of immigrants coming into the country and the number of emigrants leaving the country. It there is more coming in then add it to the natural increase. It there is less then subtract it from the natural increase.

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker