"Whereas, by the act of the Republic of Mexico, a state of war exists between that Government and the United States: Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That, for the purpose of enabling the government of the United States to prosecute said war to a speedy and successful termination, the President be, and he is hereby, authorized to employ the militia, naval, and military forces of the United States, and to call for and accept the services of any number of volunteers, not exceeding fifty thousand, who may offer their services, either as cavalry, artillery, infantry, or riflemen, to serve twelve months after they shall have arrived at the place of rendezvous, or to the end of the war, unless sooner discharged, according to the time for which they shall have been mustered into service; and that the sum of ten millions of dollars, out of any moneys in the treasury, or to come into the treasury, not otherwise appropriated, be, and the same is hereby, appropriated for the purpose of carrying the provisions of this act into effect."