Final answer:
The fundamental principle of constitutional government that says the government is only given the ability to do what the electorate (voters) allow it to do is called consent.
Step-by-step explanation:
The fundamental principle of constitutional government that says the government is only given the ability to do what the electorate (voters) allow it to do is called consent. Consent means that the government operates with the approval of the people and is limited in its power by their consent. In a constitutional government, the consent of the electorate is necessary for the government to carry out its actions.