"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.

buying socks and buying shoes are independent events.

we need the diagram to answer this correctly.