The Constitution enumerates certain powers which are reserved to the federal goverment and other powers which are delegated to the state.
Those powers which are not explicitly related in the document to any of the goverment levels will automatically be reserved to and exercised by the supreme federal goverment.
The correct answer is James Monroe.
On March 6, 1820, President James Monroe signed the Missouri Compromise which admitted Maine into the Union as a Free State and Missouri into the Union as a slave state.
