When was dungeons and dragons first established, and by who, how has it changed since?

answer:

dungeons & dragons (commonly abbreviated as d& d or dnd)[2] is a fantasy tabletop role-playing game (rpg) originally designed by gary gygax and dave arneson.[3] it was first published in 1974 by tactical studies rules, inc. (tsr). the game has been published by wizards of the coast (now a subsidiary of hasbro) since 1997. it was derived from miniature wargames, with a variation of the 1971 game chainmail serving as the initial rule system.[4] d& d's publication is commonly recognized as the beginning of modern role-playing games and the role-playing game industry.[5]

explanation:

tributary

Explanation:

In a tributary system,  a certain empire / territory that was defeated during a battle will be forced to work on behalf of the conqueror unless they want to face executions/destructions.

Tributary system was a very popular practice in the age of Empires, Even the European colonization can be considered as  some form of Tributary. This practice ended around 1800s as more countries started to transitioned into democracy and prefers to resolve their conflicts through trades and agreements.