"the constitution of the united states gives our government a legal basis for existing and since the public accepts our government's right to govern the people, the constitution also serves to promote the concept of: "

legitimacy.

Explanation:

Concept of legitimacy dictates that a certain establishment only obtain the power to rule if that establishment has the acknowledgement of the people and following all the procedures in order to obtain that power.

In united states for example,

The constitution promote this concept by listing the complete procedures along with personal requirement that all candidates need to follow in order to run for the office.  The people give their 'acknowledgement' during the voting process.

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.