What Is A Research Agreement In Civ 6

So I was confused because in previous versions, cities remain the central pillar of civilization`s gameplay. A city can be based on a site desired by a settler unit made in the same way as military units. The city will then increase in population; production of units and buildings; And create research, wealth and culture. [11] The city will also expand its boundaries with one or more tiles at the same time, which is essential to claim territories and resources. The expansion process is automated and tailored to the needs of the city, but tiles can be purchased with gold. .