Final answer:
Governments get their power/authority from the people, according to Jefferson's beliefs in republicanism.
Step-by-step explanation:
According to Jefferson, governments get their power/authority from the people. Jefferson believed in the principles of republicanism, which stated that a republican government derives its powers directly or indirectly from the great body of the people. The people exercise their power by electing representatives to govern the country. This idea of government by consent of the governed was influenced by thinkers like John Locke and Jean-Jacques Rousseau.