How to play Nations and Empires, the board game (general overview)

About Nations and Empires, from BoardGameGeek:

Nations and Empires is an expansive historical strategy game, in which you will use some of the worlds most influential and iconic historical leaders and scientists to develop your nations. Collect economy, military, science, and civil liberty tokens, while fighting to conquer your opponents empires! You'll need to strategize and use your leaders unique traits and abilities to outsmart, out-develop, and out-battle your opponents. Develop nukes with science tokens, assassinate leaders with event cards, build iconic structures, sign binding formal agreements with other nations, and more! will you be a peaceful leader who quietly develops their schools, civil liberty, and science, or a conqueror who invades all other nations, bending the world to your will?