Within less than four years the annexation of Texas to the Union has been consummated; all conflicting title to the Oregon Territory south of the forty-ninth degree of north latitude, being all that was insisted on by any of my predecessors, has been adjusted, and New Mexico and Upper California have been acquired by treaty.  The area of these several Territories, according to a report carefully prepared by the Commissioner of the General Land Office from the most authentic information in his possession, and which is herewith transmitted, contains 1,193,061 square miles, or 763,559,040 acres; while the area of the remaining twenty-nine States and the territory not yet organized into States east of the Rocky Mountains contains 2,059,513 square miles, or 1,318,126,058 acres.  These estimates show that the territories recently acquired, and over which our exclusive jurisdiction and dominion have been extended, constitute a country more than half as large as all that which was held by the United States before their acquisition.  If Oregon be excluded from the estimate, there will still remain within the limits of Texas, New Mexico, and California 851,598 square miles, or 545,012,720 acres, being an addition equal to more than one-third of all the territory owned by the United States before their acquisition, and, including Oregon, nearly as great an extent of territory as the whole of Europe, Russia only excepted.  The Mississippi, so lately the frontier of our country, is now only its center.  With the addition of the late acquisitions, the United States are now estimated to be nearly as large as the whole of Europe.  It is estimated by the Superintendent of the Coast Survey in the accompanying report that the extent of the seacoast of Texas on the Gulf of Mexico is upward of 400 miles; of the coast of Upper California on the Pacific, of 970 miles, and of Oregon, including the Straits of Fuca, of 650 miles, making the whole extent of seacoast on the Pacific 1,620 miles and the whole extent on both the Pacific and the Gulf of Mexico 2,020 miles.  The length of the coast on the Atlantic from the northern limits of the United States around the capes of Florida to the Sabine, on the eastern boundary of Texas, is estimated to be 3,100 miles; so that the addition of seacoast, including Oregon, is very nearly two-thirds as great as all we possessed before, and, excluding Oregon, is an addition of 1,370 miles, being nearly equal to one-half of the extent of coast which we possessed before these acquisitions.  We have now three great maritime fronts—­on the Atlantic, the Gulf of Mexico, and the Pacific—­making in the whole an extent of seacoast exceeding 5,000 miles.  This is the extent of the seacoast of the United States, not including bays, sounds, and small irregularities of the main shore and of the sea islands.  If these be included, the length of the shore line of coast, as estimated by the Superintendent of the Coast Survey in his report, would be 33,063 miles.