There is no definitive answer to this question as it is subjective. Some people might say that the country with the strongest people is the one with the most physically fit citizens, while others might say that it is the country with the most mentally resilient citizens. There are many factors to consider when determining which country has the strongest people, so there is no clear cut answer.
That being said, some countries do stand out as having particularly strong populations. For example, Germany has a long history of military success and its citizens are known for their discipline and hard work ethic. The United States also has a large and physically fit population, and its citizens are known for their can-do attitude and resilience in the face of adversity. Other countries with strong populations include China, Russia, and Brazil.
In conclusion, there is no easy answer to this question. It depends on what factors you deem important when measuring strength of a population. However, there are some countries that tend to have stronger populations than others due to various reasons such as history, culture, or natural resources