Final answer:
Individualism is the personality trait of the frontiersman that is most closely linked to the desire for a democratic government.
Step-by-step explanation:
The personality trait of the frontiersman that is most closely linked to the desire for a democratic government is Individualism. The concept of individualism emphasizes the importance of individuals over the community and promotes the idea of personal freedom and self-reliance. In the context of the frontiersman, their desire for self-governance and the ability to make their own decisions align with the principles of democracy.