Give a clear historical reason why all the independence winners in (Boleswa) countries were called "prime minister" instead of "president"?

The reason why all the independence winners in Boleswa countries were called "prime minister" instead of "president" is because these countries were former British colonies. In the British parliamentary system, the head of government is known as the prime minister, while the head of state is the monarch. Therefore, when these countries gained independence from Britain, they adopted the title of prime minister for their head of government, in line with the British tradition. This is in contrast to countries that were former French colonies, where the head of state is typically called the president.

There is no historical evidence to support the claim that all independence winners in "Boleswa" countries were called "prime minister" instead of "president."