Under what circumstances do supermajority voting rules prevent democracy from being fully realized

Supermajority voting rules prevent  democracy from being fully realized is discussed below in details.

Explanation:

The majority rule is a choice rule that chooses options that have a majority, that is, more than share the votes. It is the double resolution rule used most often in important decision-making parties, including the legislatures of democratic countries. Some scholars have advised against the use of majority government, at least under certain conditions, due to a notable trade-off between the interests of majority rule and other values significant to a democratic civilization. famously, it has been shown that majority rule might drive to the oppression of the majority, and the use of super majoritarian rules and constitutional limits on government authority has been suggested to decrease these outcomes. Recently some voting scholars have claimed that majority government is the rule that best defends minorities.

the border between arizona and new mexico is a thin, black line; this indicates a state boundary.

its correct: it's a thin line, and it's a state boundary, correct