Moses H. Cone Hosp. v. Mercury Constr. Corp.

Holding stay order appealable under § 1291 where it put the litigant "effectively out of court," and "surrender[ed] jurisdiction of a federal suit to a state court"

Colorado River Water Cons. Dist. v. U.S.

Holding that, in limited circumstances, federal courts should abstain from deciding a case when there are related proceedings pending in state court

Romine v. Compuserve Corp.

Holding that where in the state court depositions were taken, discovery requests and thousands of documents were exchanged, the state court has placed the case on its complex administrative track, and defendants have moved for summary judgment, and the federal action were still in the initial pleading stage, the "progress" factor weighed strongly in favor of deferring to the state court

Penn Co. v. Pennsylvania

Holding federal court had jurisdiction over first-filed federal suit

Madruga v. Superior Court

Holding that an admiralty action was permissible in diversity where "it does not affect the interests of others in the world at large, as it would if this were a proceeding in rem to enforce a lien"

Grimes v. Crown Life Ins. Co.

Finding no preemption of diversity jurisdiction statute

In re Chimenti

Finding that “admiralty and maritime claims are not removable to federal court unless there exists some independent basis, such as diversity of the parties, for federal jurisdiction.”

Kiesgen v. St. Clair Marine Salvage, Inc.

Striking defendant's third party complaint because defendant filed it after default

Republic Bank of Chicago v. Lighthouse Mgmt. Grp., Inc.

Holding that “ Section 959 applies to receivers appointed by federal courts,” not state courts

Browning v. Gotham King Fee Owner, LLC

Section 1331 - Federal question

Finding that in order to invoke federal question jurisdiction, a plaintiff's claims must arise "under the Constitution, laws, or treaties of the United States."