With regard to the external relations of the country, Congress was invested with the sole and exclusive right of determining on peace and war, unless in case of an invasion of a State by enemies, or an imminent danger of invasion by Indians; of sending and receiving ambassadors; of entering into treaties and alliances, under the limitation that no treaty of commerce could be made, which would have the effect to restrain the legislature of any State from imposing such imposts and duties on foreigners as their own people were subjected to, or which would operate to prohibit the exportation or importation of any commodity whatever. Congress was also invested with power to deal with all captures and prizes made by the land or naval forces of the United States; to grant letters of marque and reprisal in times of peace; and to establish courts for the trial of piracies and felonies committed on the high seas, and for determining appeals in cases of capture. With regard to internal affairs, Congress was invested with power to decide, in the last resort, on appeal, all disputes between two or more States, concerning boundary, jurisdiction, or any other cause; and also all controversies concerning land-titles, where the parties claimed under different grants of two or more States before the settlement of their jurisdiction; but no State was to be deprived of territory for the benefit of the United States. Congress was also invested with the sole and exclusive right and power of regulating the alloy and value of coin struck by their authority, or by that of any of the United States; of fixing the standard of weights and measures throughout the United States; of regulating the trade and managing all affairs with the Indians, who were not members of any State, provided that the legislative authority of any State, within its own limits, should not be infringed or violated; of establishing and regulating post-offices from one State to another, and exacting postage to defray the expenses; of appointing all officers of the land forces in the service of the United States, and of making rules for the government and regulation of the land and naval forces, and directing their operations.