The war with Mexico has thus fully developed the capacity of republican governments to prosecute successfully a just and necessary foreign war with all the vigor usually attributed to more arbitrary forms of government. It has been usual for writers on public law to impute to republics a want of that unity, concentration of purpose, and vigor of execution which are generally admitted to belong to the monarchical and aristocratic forms; and this feature of popular government has been supposed to display itself more particularly in the conduct of a war carried on in an enemy's territory. The war with Great Britain in 1812 was to a great extent confined within our own limits, and shed but little light on this subject; but the war which we have just closed by an honorable peace evinces beyond all doubt that a popular representative government is equal to any emergency which is likely to arise in the affairs of a nation. The war with Mexico has developed most strikingly and conspicuously another feature in our institutions. It is that without cost to the Government or danger to our liberties we have in the bosom of our society of freemen, available in a just and necessary war, virtually a standing army of 2,000,000 armed citizen soldiers, such as fought the battles of Mexico. But our military strength does not consist alone in our capacity for extended and successful operations on land. The Navy is an important arm of the national defense. If the services of the Navy were not so brilliant as those of the Army in the late war with Mexico, it was because they had no enemy to meet on their own element. While the Army had opportunity of performing more conspicuous service, the Navy largely participated in the conduct of the war. Both branches of the service performed their whole duty to the country. For the able and gallant services of the officers and men of the Navy, acting independently as well as in cooperation with our troops, in the conquest of the Californias, the capture of Vera Cruz, and the seizure and occupation of other important positions on the Gulf and Pacific coasts, the highest praise is due. Their vigilance, energy, and skill rendered the most effective service in excluding munitions of war and other supplies from the enemy, while they secured a safe entrance for abundant supplies for our own Army. Our extended commerce was nowhere interrupted, and for this immunity from the evils of war the country is indebted to the Navy.