I transmit herewith, for the consideration and determination of Congress, an application of the Republic of Santo Domingo to this Government to exercise a protectorate over that Republic.

Since the adjournment of Congress the following treaties with foreign powers have been proclaimed: A naturalization convention with Denmark; a convention with Mexico for renewing the Claims Commission; a convention of friendship, commerce, and extradition with the Orange Free State, and a naturalization convention with Ecuador.

I renew the recommendation made in my message of December, 1870, that Congress authorize the Postmaster-General to issue all commissions to officials appointed through his Department.

I invite the earnest attention of Congress to the existing laws of the United States respecting expatriation and the election of nationality by individuals. Many citizens of the United States reside permanently abroad with their families. Under the provisions of the act approved February 10, 1855, the children of such persons are to be deemed and taken to be citizens of the United States, but the rights of citizenship are not to descend to persons whose fathers never resided in the United States.

It thus happens that persons who have never resided within the United States have been enabled to put forward a pretension to the protection of the United States against the claim to military service of the government under whose protection they were born and have been reared. In some cases even naturalized citizens of the United States have returned to the land of their birth, with intent to remain there, and their children, the issue of a marriage contracted there after their return, and who have never been in the United States, have laid claim to our protection when the lapse of many years had imposed upon them the duty of military service to the only government which had ever known them personally.

Until the year 1868 it was left, embarrassed by conflicting opinions of courts and of jurists, to determine how far the doctrine of perpetual allegiance derived from our former colonial relations with Great Britain was applicable to American citizens. Congress then wisely swept these doubts away by enacting that--Any declaration, instruction, opinion, order, or decision of any officer of this Government which denies, restricts, impairs, or questions the right of expatriation is inconsistent with the fundamental principles of this Government. But Congress did not indicate in that statute, nor has it since done so, what acts are to be deemed to work expatriation. For my own guidance in determining such questions I required (under the provisions of the Constitution) the opinion in writing of the principal officer in each of the Executive Departments upon certain questions relating to this subject. The result satisfies me that further legislation has become necessary. I therefore commend the subject to the careful consideration of Congress, and I transmit herewith copies of the several opinions of the principal officers of the Executive Departments, together with other correspondence and pertinent information on the same subject.

The United States, who led the way in the overthrow of the feudal doctrine of perpetual allegiance, are among the last to indicate how their own citizens may elect another nationality. The papers submitted herewith indicate what is necessary to place us on a par with other leading nations in liberality of legislation on this international question. We have already in our treaties assented to the principles which would need to be embodied in laws intended to accomplish such results. We have agreed that citizens of the United States may cease to be citizens and may voluntarily render allegiance to other powers. We have agreed that residence in a foreign land, without intent to return, shall of itself work expatriation. We have agreed in some instances upon the length of time necessary for such continued residence to work a presumption of such intent. I invite Congress now to mark out and define when and how expatriation can be accomplished; to regulate by law the condition of American women marrying foreigners; to fix the status of children born in a foreign country of American parents residing more or less permanently abroad, and to make rules for determining such other kindred points as may seem best to Congress.

In compliance with the request of Congress, I transmitted to the American minister at Madrid, with instructions to present it to the Spanish Government, the joint resolution approved on the 3d of March last, tendering to the people of Spain, in the name and on the behalf of the American people, the congratulations of Congress upon the efforts to consolidate in Spain the principles of universal liberty in a republican form of government.

The existence of this new Republic was inaugurated by striking the fetters from the slaves in Porto Rico. This beneficent measure was followed by the release of several thousand persons illegally held as slaves in Cuba. Next, the Captain-General of that colony was deprived of the power to set aside the orders of his superiors at Madrid, which had pertained to the office since 1825. The sequestered estates of American citizens, which had been the cause of long and fruitless correspondence, were ordered to be restored to their owners. All these liberal steps were taken in the face of a violent opposition directed by the reactionary slave-holders of Havana, who are vainly striving to stay the march of ideas which has terminated slavery in Christendom, Cuba only excepted. Unhappily, however, this baneful influence has thus far succeeded in defeating the efforts of all liberal-minded men in Spain to abolish slavery in Cuba, and in preventing the promised reform in that island. The struggle for political supremacy continues there.

The proslavery and aristocratic party in Cuba is gradually arraigning itself in more and more open hostility and defiance of the home government, while it still maintains a political connection with the Republic in the peninsula; and although usurping and defying the authority of the home government whenever such usurpation or defiance tends in the direction of oppression or of the maintenance of abuses, it is still a power in Madrid, and is recognized by the Government. Thus an element more dangerous to continued colonial relations between Cuba and Spain than that which inspired the insurrection at Yara--an element opposed to granting any relief from misrule and abuse, with no aspirations after freedom, commanding no sympathies in generous breasts, aiming to rivet still stronger the shackles of slavery and oppression--has seized many of the emblems of power in Cuba, and, under professions of loyalty to the mother country, is exhausting the resources of the island, and is doing acts which are at variance with those principles of justice, of liberality, and of right which give nobility of character to a republic. In the interests of humanity, of civilization, and of progress, it is to be hoped that this evil influence may be soon averted.