28 U.S.C. § 1332 : US Code - Section 1332: Diversity of citizenship; amount in controversy; costs

      (a) The district courts shall have original jurisdiction of all
    civil actions where the matter in controversy exceeds the sum or
    value of $75,000, exclusive of interest and costs, and is between -
    
        (1) citizens of different States;
        (2) citizens of a State and citizens or subjects of a foreign
      state, except that the district courts shall not have original
      jurisdiction under this subsection of an action between citizens
      of a State and citizens or subjects of a foreign state who are
      lawfully admitted for permanent residence in the United States
      and are domiciled in the same State;
        (3) citizens of different States and in which citizens or
      subjects of a foreign state are additional parties; and
        (4) a foreign state, defined in section 1603(a) of this title,
      as plaintiff and citizens of a State or of different States.

      (b) Except when express provision therefor is otherwise made in a
    statute of the United States, where the plaintiff who files the
    case originally in the Federal courts is finally adjudged to be
    entitled to recover less than the sum or value of $75,000, computed
    without regard to any setoff or counterclaim to which the defendant
    may be adjudged to be entitled, and exclusive of interest and
    costs, the district court may deny costs to the plaintiff and, in
    addition, may impose costs on the plaintiff.
      (c) For the purposes of this section and section 1441 of this
    title - 
        (1) a corporation shall be deemed to be a citizen of every
      State and foreign state by which it has been incorporated and of
      the State or foreign state where it has its principal place of
      business, except that in any direct action against the insurer of
      a policy or contract of liability insurance, whether incorporated
      or unincorporated, to which action the insured is not joined as a
      party-defendant, such insurer shall be deemed a citizen of - 
          (A) every State and foreign state of which the insured is a
        citizen;
          (B) every State and foreign state by which the insurer has
        been incorporated; and
          (C) the State or foreign state where the insurer has its
        principal place of business; and

        (2) the legal representative of the estate of a decedent shall
      be deemed to be a citizen only of the same State as the decedent,
      and the legal representative of an infant or incompetent shall be
      deemed to be a citizen only of the same State as the infant or
      incompetent.

      (d)(1) In this subsection - 
        (A) the term "class" means all of the class members in a class
      action;
        (B) the term "class action" means any civil action filed under
      rule 23 of the Federal Rules of Civil Procedure or similar State
      statute or rule of judicial procedure authorizing an action to be
      brought by 1 or more representative persons as a class action;
        (C) the term "class certification order" means an order issued
      by a court approving the treatment of some or all aspects of a
      civil action as a class action; and
        (D) the term "class members" means the persons (named or
      unnamed) who fall within the definition of the proposed or
      certified class in a class action.

      (2) The district courts shall have original jurisdiction of any
    civil action in which the matter in controversy exceeds the sum or
    value of $5,000,000, exclusive of interest and costs, and is a
    class action in which - 
        (A) any member of a class of plaintiffs is a citizen of a State
      different from any defendant;
        (B) any member of a class of plaintiffs is a foreign state or a
      citizen or subject of a foreign state and any defendant is a
      citizen of a State; or
        (C) any member of a class of plaintiffs is a citizen of a State
      and any defendant is a foreign state or a citizen or subject of a
      foreign state.

      (3) A district court may, in the interests of justice and looking
    at the totality of the circumstances, decline to exercise
    jurisdiction under paragraph (2) over a class action in which
    greater than one-third but less than two-thirds of the members of
    all proposed plaintiff classes in the aggregate and the primary
    defendants are citizens of the State in which the action was
    originally filed based on consideration of - 
        (A) whether the claims asserted involve matters of national or
      interstate interest;
        (B) whether the claims asserted will be governed by laws of the
      State in which the action was originally filed or by the laws of
      other States;
        (C) whether the class action has been pleaded in a manner that
      seeks to avoid Federal jurisdiction;
        (D) whether the action was brought in a forum with a distinct
      nexus with the class members, the alleged harm, or the
      defendants;
        (E) whether the number of citizens of the State in which the
      action was originally filed in all proposed plaintiff classes in
      the aggregate is substantially larger than the number of citizens
      from any other State, and the citizenship of the other members of
      the proposed class is dispersed among a substantial number of
      States; and
        (F) whether, during the 3-year period preceding the filing of
      that class action, 1 or more other class actions asserting the
      same or similar claims on behalf of the same or other persons
      have been filed.

      (4) A district court shall decline to exercise jurisdiction under
    paragraph (2) - 
        (A)(i) over a class action in which - 
          (I) greater than two-thirds of the members of all proposed
        plaintiff classes in the aggregate are citizens of the State in
        which the action was originally filed;
          (II) at least 1 defendant is a defendant - 
            (aa) from whom significant relief is sought by members of
          the plaintiff class;
            (bb) whose alleged conduct forms a significant basis for
          the claims asserted by the proposed plaintiff class; and
            (cc) who is a citizen of the State in which the action was
          originally filed; and

          (III) principal injuries resulting from the alleged conduct
        or any related conduct of each defendant were incurred in the
        State in which the action was originally filed; and

        (ii) during the 3-year period preceding the filing of that
      class action, no other class action has been filed asserting the
      same or similar factual allegations against any of the defendants
      on behalf of the same or other persons; or
        (B) two-thirds or more of the members of all proposed plaintiff
      classes in the aggregate, and the primary defendants, are
      citizens of the State in which the action was originally filed.

      (5) Paragraphs (2) through (4) shall not apply to any class
    action in which - 
        (A) the primary defendants are States, State officials, or
      other governmental entities against whom the district court may
      be foreclosed from ordering relief; or
        (B) the number of members of all proposed plaintiff classes in
      the aggregate is less than 100.

      (6) In any class action, the claims of the individual class
    members shall be aggregated to determine whether the matter in
    controversy exceeds the sum or value of $5,000,000, exclusive of
    interest and costs.
      (7) Citizenship of the members of the proposed plaintiff classes
    shall be determined for purposes of paragraphs (2) through (6) as
    of the date of filing of the complaint or amended complaint, or, if
    the case stated by the initial pleading is not subject to Federal
    jurisdiction, as of the date of service by plaintiffs of an amended
    pleading, motion, or other paper, indicating the existence of
    Federal jurisdiction.
      (8) This subsection shall apply to any class action before or
    after the entry of a class certification order by the court with
    respect to that action.
      (9) Paragraph (2) shall not apply to any class action that solely
    involves a claim - 
        (A) concerning a covered security as defined under 16(f)(3)
      (!1) of the Securities Act of 1933 (15 U.S.C. 78p(f)(3) (!2)) and
      section 28(f)(5)(E) of the Securities Exchange Act of 1934 (15
      U.S.C. 78bb(f)(5)(E));


        (B) that relates to the internal affairs or governance of a
      corporation or other form of business enterprise and that arises
      under or by virtue of the laws of the State in which such
      corporation or business enterprise is incorporated or organized;
      or
        (C) that relates to the rights, duties (including fiduciary
      duties), and obligations relating to or created by or pursuant to
      any security (as defined under section 2(a)(1) of the Securities
      Act of 1933 (15 U.S.C. 77b(a)(1)) and the regulations issued
      thereunder).

      (10) For purposes of this subsection and section 1453, an
    unincorporated association shall be deemed to be a citizen of the
    State where it has its principal place of business and the State
    under whose laws it is organized.
      (11)(A) For purposes of this subsection and section 1453, a mass
    action shall be deemed to be a class action removable under
    paragraphs (2) through (10) if it otherwise meets the provisions of
    those paragraphs.
      (B)(i) As used in subparagraph (A), the term "mass action" means
    any civil action (except a civil action within the scope of section
    1711(2)) in which monetary relief claims of 100 or more persons are
    proposed to be tried jointly on the ground that the plaintiffs'
    claims involve common questions of law or fact, except that
    jurisdiction shall exist only over those plaintiffs whose claims in
    a mass action satisfy the jurisdictional amount requirements under
    subsection (a).
      (ii) As used in subparagraph (A), the term "mass action" shall
    not include any civil action in which - 
        (I) all of the claims in the action arise from an event or
      occurrence in the State in which the action was filed, and that
      allegedly resulted in injuries in that State or in States
      contiguous to that State;
        (II) the claims are joined upon motion of a defendant;
        (III) all of the claims in the action are asserted on behalf of
      the general public (and not on behalf of individual claimants or
      members of a purported class) pursuant to a State statute
      specifically authorizing such action; or
        (IV) the claims have been consolidated or coordinated solely
      for pretrial proceedings.

      (C)(i) Any action(s) removed to Federal court pursuant to this
    subsection shall not thereafter be transferred to any other court
    pursuant to section 1407, or the rules promulgated thereunder,
    unless a majority of the plaintiffs in the action request transfer
    pursuant to section 1407.
      (ii) This subparagraph will not apply - 
        (I) to cases certified pursuant to rule 23 of the Federal Rules
      of Civil Procedure; or
        (II) if plaintiffs propose that the action proceed as a class
      action pursuant to rule 23 of the Federal Rules of Civil
      Procedure.

      (D) The limitations periods on any claims asserted in a mass
    action that is removed to Federal court pursuant to this subsection
    shall be deemed tolled during the period that the action is pending
    in Federal court.
      (e) The word "States", as used in this section, includes the
    Territories, the District of Columbia, and the Commonwealth of
    Puerto Rico.