Federalist Papers 3E

Because, even if the governing party in a State should be disposed to resist such temptations, yet as such temptations may, and commonly do, result from circumstances peculiar to the State, and may affect a great number of the inhabitants, the governing party may not always be able, if willing, to prevent the injustice meditated, or to punish the aggressors. But the national government, not being affected by those local circumstances, will neither be induced to commit the wrong themselves, nor want power or inclination to prevent or punish its commission by others.

So far, therefore, as either designed or accidental violations of treaties and the laws of nations afford JUST causes of war, they are less to be apprehended under one general government than under several lesser ones, and in that respect the former most favors the SAFETY of the people.

As to those just causes of war which proceed from direct and unlawful violence, it appears equally clear to me that one good national government affords vastly more security against dangers of that sort than can be derived from any other quarter.

Because such violences are more frequently caused by the passions and interests of a part than of the whole; of one or two States than of the Union. Not a single Indian war has yet been occasioned by aggressions of the present federal government, feeble as it is; but there are several instances of Indian hostilities having been provoked by the improper conduct of individual States, who, either unable or unwilling to restrain or punish offenses, have given occasion to the slaughter of many innocent inhabitants.

Federalist Papers 3D

Because, under the national government, treaties and articles of treaties, as well as the laws of nations, will always be expounded in one sense and executed in the same manner,--whereas, adjudications on the same points and questions, in thirteen States, or in three or four confederacies, will not always accord or be consistent; and that, as well from the variety of independent courts and judges appointed by different and independent governments, as from the different local laws and interests which may affect and influence them. The wisdom of the convention, in committing such questions to the jurisdiction and judgment of courts appointed by and responsible only to one national government, cannot be too much commended.

Because the prospect of present loss or advantage may often tempt the governing party in one or two States to swerve from good faith and justice; but those temptations, not reaching the other States, and consequently having little or no influence on the national government, the temptation will be fruitless, and good faith and justice be preserved. The case of the treaty of peace with Britain adds great weight to this reasoning.

Federalist Papers 3C

It is of high importance to the peace of America that she observe the laws of nations towards all these powers, and to me it appears evident that this will be more perfectly and punctually done by one national government than it could be either by thirteen separate States or by three or four distinct confederacies.

Because when once an efficient national government is established, the best men in the country will not only consent to serve, but also will generally be appointed to manage it; for, although town or country, or other contracted influence, may place men in State assemblies, or senates, or courts of justice, or executive departments, yet more general and extensive reputation for talents and other qualifications will be necessary to recommend men to offices under the national government,--especially as it will have the widest field for choice, and never experience that want of proper persons which is not uncommon in some of the States. Hence, it will result that the administration, the political counsels, and the judicial decisions of the national government will be more wise, systematical, and judicious than those of individual States, and consequently more satisfactory with respect to other nations, as well as more SAFE with respect to us.