What is Confederacy?

Legal Definition
Intern. law. An agreement between two or more states or nations, by which they unite for their mutual protection and good. This term is applied to such agreement between two independent nations, but it is used to signify the union of different states of the same nation, as the confederacy of the states.

2. The original thirteen states, in 1781, adopted for their federal government the " Articles of confederation and perpetual union between the States," which continued in force until the present constitution of the United States went into full operation, on the 30th day of April, 1789, when president Washington was sworn into office. Vide 1 Story on the Const. B. 2, c. 3 and 4.
-- Bouviers Law Dictionary
Legal Definition
Crim. law. An agreement between two or more persons to do an unlawful act, or an act, which though not unlawful in itself, becomes so by the confederacy. The technical term usually employed to signify this offence, is conspiracy. (q. v.)
-- Bouviers Law Dictionary
Legal Definition
Equity pleading. The fourth part of a bill in chancery usually charges a confederacy; this is either general or special.

2. The first is by alleging a general charge of confederacy between the defendants and other persons to injure or defraud the plaintiff. The common form of the charge is, that the defendants, combining and confederating together, to and with divers other persons as yet to the plaintiff unknown, but whose names, when discovered, he prays may be inserted in the bill, and they be made parties thereto, with proper and apt words to charge them with the premises, in order to injure and oppress the plaintiff in ti e premises, do absolutely refuse, &c. Mitf. Eq. Pl. by Jeremy, 40; Coop. Eq. Pl. 9 Story, Eq. Pl. 29; 1 Mont. Eq. Pl. 77; Barton, Suit in Eq. 33; Van Heyth. Eq. Drafts, 4.

3. When it is intended to rely on a confederacy or combination as a ground of equitable jurisdiction, the confederacy must be specially charged to justify an assumption of jurisdiction. Mitf. Eq. Pl. by Jeremy, 41; Story, Eq. Pl. 30.

4. A general allegation of confederacy is now considered as mere form. Story, Eq. Pl. 29; 4 Bouv. Inst. n. 4169.
-- Bouviers Law Dictionary
Legal Definition
In criminal law. The association or banding together of two or more persons for the purpose of committing an act or furthering an enterprise which is forbidden by law, or which, though lawful in itself, becomes unlawful when made the object of the confederacy. State v. Crowley, 41 Wis. 284, 22 Am. Rep. 719; Watson v. Navigation Co., 52 How. Prae. (N. Y.) 353.

Conspiracy is a more technical term for this offence. The act of two or more who combine together to do any damage or injury to another, or to do any unlawful act. Jacob. See Watson v. Navigation Co., 52 How. Prac. (N. Y.) 353; State v. Crowley, 41 Wis. 284, 22 Am. Rep. 719.

In equity pleading. An improper combination alleged to have been entered into between the defendants to a blll in equity. In international law. A league or agreement between two or more independent states whereby they unite for their mutual welfare and the furtherance of their common aims. The term may apply to a union so formed for a temporary or limited purpose, as in the case of an offensive and defensive alliance; but it is more commonly used to denote that species of political connection between two or more independent states by which a central government is created, invested with certain powers of sovereignty, (mostly external,) and acting upon the several component states as its units, which, however, retain their sovereign powers for domestic purposes and some others. See Federal Government.
-- Black's Law Dictionary
Legal Definition
A contract or agreement for mutual support, a confederation.
-- Ballentine's Law Dictionary