The best grand strategy games to play in 2020

Grand strategy games are an emerging sub-genre of strategy gaming - encompassing long periods of history (or, if sci-fi, time), they involve many intricate layers that players need to contend with. It's not just about winning that war or setting up this mine; you've got to develop infrastructure, set policy, and manage internal dynamics as well as international or extra-polity relations.
This genre often involves the exploration of the map in order to better understand the resources at your command and the position of your enemies - and your friends. Lines blur when picking apart the edge cases, but by and large count on grand strategy games to make the management of your faction the primary part of the experience. They often over-lap with other genre within strategy gaming, especially 4X games, but a key difference can be in framing. Games like Civilization, for example, typically put the emphasis on managing military resources in particular, with other mechanics in a supporting role.
It can also be just as much down to accepted definitions and chosen marketing. More and more game are choosing to identify as grand strategy, so it's definitely a genre worth exploring in more detail.
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