The Federalist Papers mainly argued for ratification of the Constitution and promised that

The national government would respect state governments' and citizens' rights.

Explanation:

The Federalist papers were a collection of eighty-five essays written by James Madison, John Jay, and Alexander Hamilton under the anonymous name of "Publius". The Federalist papers were published in newspapers in New York and other states to convince people about the need of a strong federal government, to support the ratification of the Constitution and to assure that the federal government would respect state governments' and citizens' rights.

Under Federalist paper No. 21 Alexander Hamilton stated the need of a strong federal government that could maintain the Union together, because if not, states could break into rival confederacies. Hamilton explained that the federal government wouldn't intervene in the states' governments and internal affairs but would provide protection to each state and would maintain all states unified.