Answer:Here are the definitions and examples of countries that have or had each form of government1. Dictatorship: A form of government where a single leader or a small group holds absolute power without constitutional limitations.Example: North Korea (Kim Jong-un’s regime), Nazi Germany under Adolf Hitler, or Cuba under Fidel Castro.2. Oligarchy: A form of government in which power is held by a small group of individuals, often from the same economic, social, or political class.Example: Russia (modern political structure with influence of wealthy elites), or Ancient Sparta.3. Monarchy: A system of government in which a single ruler, the monarch, holds supreme authority, often for life and by hereditary right.Example: United Kingdom (constitutional monarchy), Saudi Arabia (absolute monarchy), or France before the French Revolution.4. Democracy: A system of government where the citizens exercise power by voting and have a say in the decision-making process.Example: United States, India, or Athens in Ancient Greece (direct democracy).