Defining the world's most powerful countries is not clear-cut. The most powerful nations shape their economic patterns and have strong military and defense.

The top 8 most powerful countries in the world are listed below. 

1. United States 

2. Russia 

3. China

4. Germany 

5. United kingdom 

6. France 

7. Japan

8. Israel 

1. United States 

According to the survey, the United States is the world's most powerful country. It has the world's largest economy. The population growth of the United States on average is about 0.9% per year. The United States population is expected to grow more throughout the century.

Population Growth 

The population of the United States grew rapidly when the first census was held in 1970 after independence. Now the population reaches 4 million. The census is held only once in ten years to count the number of people in the country. The last census was held in 2010.

2. Russia 

Russia has one of the lowest fertility rates in the world. It also has one of the oldest populations in the world, with an average of 40.3 years. 

Population Growth 

It is estimated that Russia will fall from the 9th most populous country to the 17th by 2050. The population of Russia has dropped from 142 million in 2014 to 128 million by 2050. It is one of the few countries with a negative growth rate. Russia takes census after every decade. But there is no fixed schedule until 2009.

3. China 

The population of China will finally peak in 2030 with a labor force and overpopulation of 240 million. It has another serious problem, and its one child policy results in the ratio of 120 boys and 100 girls. 

Population Growth 

The scheme of having just one child proved so successful. As a result, China has a low birth rate now. China has slowed significantly since the implementation of the one-child policy. 

4. Germany 

Germany's population is expected to peak at the end of 2021. Its population is about 83.9 million. The death rate of Germany has been higher than its birth rate. Germany is divided into sixteen states, and each state has its own capital. A few large cities of Germany have a population of 1 million people. 

5. United kingdom 

The population of the United Kingdom will be surpassing 75 million in 2060. The current population of the United Kingdom is 68,189,116. The United Kingdom is made up of multiple nations. Its population is expected to grow rapidly in the 21st century. 

6. France 

France's population is expected to reach its peak of 67.68 million people in 2045. France was one of the fertile countries. Its rate is beginning to change. In 2011, France was growing faster than other countries across the world. 

Population Growth 

Its population is expected to grow by another 9 million people over the next forty years. With this population, France is back in the race to be a populous country. 

7. Japan

Japan's population has declined since 2009. In 2009 its population was 128.56 million and was expected to reach 126.56 million at the end of 2020.

The main reason for the decline in Japan's population is a rapid decrease in births. 

Population Growth 

Its population began to decline in 2011. In 2018 there were less than one million babies born. One reason for the low birth rate is the lack of good jobs. Lack of jobs prevents men from starting their families because they cannot afford it. 

The current population of Japan is 126,073,844.

8. Israel 

According to the current projections, Israel's population is expected to grow throughout the 21st century. It has a population of 8.61 million in 2020. By 2050 it will reach 12.72 million. 

Population Growth 

According to the size of the country, its population is very high. Generally,  the growth rate increased by 138,000 or 1.8%. Using the available statistics, projections on Israel's population can be made showing approximate population.