San Domingo will become a large consumer of the products of Northern farms and manufactories. The cheap rate at which her citizens can be furnished with food, tools, and machinery will make it necessary that contiguous islands should have the same advantages in order to compete in the production of sugar, coffee, tobacco, tropical fruits, etc. This will open to us a still wider market for our products. The production of our own supply of these articles will cut off more than one hundred millions of our annual imports, besides largely increasing our exports. With such a picture it is easy to see how our large debt abroad is ultimately to be extinguished. With a balance of trade against us (including interest on bonds held by foreigners and money spent by our citizens traveling in foreign lands) equal to the entire yield of the precious metals in this country, it is not so easy to see how this result is to be otherwise accomplished.

The acquisition of San Domingo is an adherence to the "Monroe doctrine;" it is a measure of national protection; it is asserting our just claim to a controlling influence over the great commercial traffic soon to flow from west to east by way of the Isthmus of Darien; it is to build up our merchant marine; it is to furnish new markets for the products of our farms, shops, and manufactories; it is to make slavery insupportable in Cuba and Porto Rico at once, and ultimately so in Brazil; it is to settle the unhappy condition of Cuba and end an exterminating conflict; it is to provide honest means of paying our honest debts without overtaxing the people; it is to furnish our citizens with the necessaries of everyday life at cheaper rates than ever before; and it is, in fine, a rapid stride toward that greatness which the intelligence, industry, and enterprise of the citizens of the United States entitle this country to assume among nations.

In view of the importance of this question, I earnestly urge upon Congress early action expressive of its views as to the best means of acquiring San Domingo. My suggestion is that by joint resolution of the two Houses of Congress the Executive be authorized to appoint a commission to negotiate a treaty with the authorities of San Domingo for the acquisition of that island, and that an appropriation be made to defray the expenses of such a commission. The question may then be determined, either by the action of the Senate upon the treaty or the joint action of the two Houses of Congress upon a resolution of annexation, as in the case of the acquisition of Texas. So convinced am I of the advantages to flow from the acquisition of San Domingo, and of the great disadvantages--I might almost say calamities--to flow from nonacquisition, that I believe the subject has only to be investigated to be approved.

It is to be regretted that our representations in regard to the injurious effects, especially upon the revenue of the United States, of the policy of the Mexican Government in exempting from impost duties a large tract of its territory on our borders have not only been fruitless, but that it is even proposed in that country to extend the limits within which the privilege adverted to has hitherto been enjoyed. The expediency of taking into your serious consideration proper measures for countervailing the policy referred to will, it is presumed, engage your earnest attention.

It is the obvious interest, especially of neighboring nations, to provide against impunity to those who may have committed high crimes within their borders and who may have sought refuge abroad. For this purpose extradition treaties have been concluded with several of the Central American Republics, and others are in progress.

The sense of Congress is desired, as early as may be convenient, upon the proceedings of the commission on claims against Venezuela, as communicated in my messages of March 16, 1869, March 1, 1870, and March 31, 1870. It has not been deemed advisable to distribute any of the money which has been received from that Government until Congress shall have acted on the subject.

The massacres of French and Russian residents at Tien-Tsin, under circumstances of great barbarity, was supposed by some to have been premeditated, and to indicate a purpose among the populace to exterminate foreigners in the Chinese Empire. The evidence fails to establish such a supposition, but shows a complicity between the local authorities and the mob. The Government at Peking, however, seems to have been disposed to fulfill its treaty obligations so far as it was able to do so. Unfortunately, the news of the war between the German States and France reached China soon after the massacre. It would appear that the popular mind became possessed with the idea that this contest, extending to Chinese waters, would neutralize the Christian influence and power, and that the time was coming when the superstitious masses might expel all foreigners and restore mandarin influence. Anticipating trouble from this cause, I invited France and North Germany to make an authorized suspension of hostilities in the East (where they were temporarily suspended by act of the commanders), and to act together for the future protection in China of the lives and properties of Americans and Europeans.

Since the adjournment of Congress the ratifications of the treaty with Great Britain for abolishing the mixed courts for the suppression of the slave trade have been exchanged. It is believed that the slave trade is now confined to the eastern coast of Africa, whence the slaves are taken to Arabian markets.

The ratifications of the naturalization convention between Great Britain and the United States have also been exchanged during the recess, and thus a long-standing dispute between the two Governments has been settled in accordance with the principles always contended for by the United States.

In April last, while engaged in locating a military reservation near Pembina, a corps of engineers discovered that the commonly received boundary line between the United States and the British possessions at that place is about 4,700 feet south of the true position of the forty-ninth parallel, and that the line, when run on what is now supposed to be the true position of that parallel, would leave the fort of the Hudsons Bay Company at Pembina within the territory of the United States. This information being communicated to the British Government, I was requested to consent, and did consent, that the British occupation of the fort of the Hudsons Bay Company should continue for the present. I deem it important, however, that this part of the boundary line should be definitely fixed by a joint commission of the two Governments, and I submit herewith estimates of the expense of such a commission on the part of the United States and recommend that an appropriation be made for that purpose. The land boundary has already been fixed and marked from the summit of the Rocky Mountains to the Georgian Bay. It should now be in like manner marked from the Lake of the Woods to the summit of the Rocky Mountains.