What does it mean that you have a two-party system because it is self-perpetuating?

A two-party system is considered self-perpetuating because established parties tend to reinforce each other's dominance, creating a cycle that discourages the rise of third parties. This occurs through mechanisms like electoral laws that favor larger parties, voter behavior that aligns with perceived viable candidates, and the media's focus on the leading parties. As a result, voters often feel compelled to support one of the two major parties to avoid "wasting" their vote, further entrenching the two-party landscape. Consequently, the system becomes resistant to change, perpetuating the status quo.