Checks and Balances: Presidential System of Government

Indeed, it is a fiction to talk of separation of powers in a presidential system as the three branches of government interact with one another in diverse ways in order to ensure the smooth operation of government. Such instances of cooperation or balancing acts are ironically examples of checks and balances.
Mayan Civilization

Maya Civilization: History, Culture, Economy & Characteristics

The Mayans were a civilization, settled in Central America, that lasted from the 20th Century BC until the 15 Century BC, when it came to an end during the conquest of America. This culture introduced great advances in mathematics, writing, architecture and astronomy, and had its own social, political and religious organization, which influenced the development of later cultures.