It was the first methodological study<span> of a social fact in the context of society.</span>
I believe the answer is <span> the social exchange theory
</span><span> the social exchange theory is based on the assumption that all people are individualistic in nature.
</span>This theory believes that human only choose to interact with another human only if the benefit from interacting with that other human surpass the cost to interact with him. (which explains the reason some people choose to marry old -rich individuals despite negative perception that will be labeled to them)
Because they won lots of land and became a bigger country
