Final answer:
True, the national government has the authority to send troops to a state to quell civil disorder without an invitation by the state's governor, as demonstrated during historical events such as the Whiskey Rebellion and under acts like the First Enforcement Act of 1870.
Step-by-step explanation:
The question of whether the national government has the authority to send troops to a state to quell civil disorder without an invitation by the state's governor can be answered as true. History provides multiple precedents where such actions have been taken. For instance, during the Whiskey Rebellion, President George Washington sent troops to suppress the insurgence without an explicit request from the state’s governor.
Similarly, the First Enforcement Act of 1870 granted the president the authority to deploy federal troops to protect civil and political rights, specifically allowing for federal intervention in the South after the Civil War to ensure that federal laws and rights were upheld. Nevertheless, it’s often expected that local and state resources are to be utilized first before the national government steps in.
Under the Constitution and several acts of Congress, the national government retains the power to address domestic problems and to ensure the peace. These powers can be exercised in situations where there is an invasion, insurrection, or where civil rights are being obstructed, and the state is deemed unable or unwilling to handle the situation effectively. Such powers are part of the government's responsibility to maintain order and protect the rights of citizens.