If Congress should deem slaves or free colored persons injurious to the population of a free Territory, as conducing to lessen the value of the public lands, or on any other ground connected with the public interest, they have the power to prohibit them from becoming settlers in it. This can be sustained on the ground of a sound national policy, which is so clearly shown in our history by practical results, that it would seem no considerate individual can question it. And, as regards any unfairness of such a policy to our Southern brethren, as urged in the argument, it is only necessary to say that, with one-fourth of the Federal population of the Union, they have in the slave States a larger extent of fertile territory than is included in the free States; and it is submitted, if masters of slaves be restricted from bringing them into free territory, that the restriction on the free citizens of non-slaveholding States, by bringing slaves into free territory, is four times greater than that complained of by the South. But, not only so; some three or four hundred thousand holders of slaves, by bringing them into free territory, impose a restriction on twenty millions of the free States. The repugnancy to slavery would probably prevent fifty or a hundred freemen from settling in a slave Territory, where one slaveholder would be prevented from settling in a free Territory. This remark is made in answer to the argument urged, that a prohibition of slavery in the free Territories is inconsistent with the continuance of the Union. Where a Territorial Government is established in a slave Territory, it has uniformly remained in that condition until the people form a State Constitution; the same course where the Territory is free, both parties acting in good faith, would be attended with satisfactory results. The sovereignty of the Federal Government extends to the entire limits of our territory. Should any foreign power invade our jurisdiction, it would be repelled. There is a law of Congress to punish our citizens for crimes committed in districts of country where there is no organized Government. Criminals are brought to certain Territories or States, designated in the law, for punishment. Death has been inflicted in Arkansas and in Missouri, on individuals, for murders committed beyond the limit of any organized Territory or State; and no one doubts that such a jurisdiction was rightfully exercised. If there be a right to acquire territory, there necessarily must be an implied power to govern it. When the military force of the Union shall conquer a country, may not Congress provide for the government of such country? This would be an implied power essential to the acquisition of new territory. This power has been exercised, without doubt of its constitutionality, over territory acquired by conquest and purchase.