42 USC 601 - Purpose

(a) In general 
The purpose of this part is to increase the flexibility of States in operating a program designed to
(1) provide assistance to needy families so that children may be cared for in their own homes or in the homes of relatives;
(2) end the dependence of needy parents on government benefits by promoting job preparation, work, and marriage;
(3) prevent and reduce the incidence of out-of-wedlock pregnancies and establish annual numerical goals for preventing and reducing the incidence of these pregnancies; and

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(4) encourage the formation and maintenance of two-parent families.
(b) No individual entitlement 
This part shall not be interpreted to entitle any individual or family to assistance under any State program funded under this part.