Diversity of citizenship is a basis for federal court jurisdiction primarily when what condition is met?

Diversity of citizenship is a fundamental concept in federal court jurisdiction that arises when the parties involved are from different states or countries. For federal courts to have jurisdiction based on diversity of citizenship, two specific conditions must typically be fulfilled: the parties must be citizens of different states (or a citizen of a state and a citizen of a foreign country), and the amount in controversy must exceed a specified threshold.

In this context, the correct answer highlights that the federal court's jurisdiction based on diversity of citizenship requires the amount in controversy to exceed $75,000. This threshold is set by the statute and is intended to prevent federal courts from being overwhelmed by minor disputes that might be more appropriately handled in state courts.

While diversity of citizenship can involve parties who are all foreign entities, this does not inherently establish federal jurisdiction without considering the amount in controversy. Additionally, cases that involve criminal law generally fall under state jurisdiction and are not typically a matter for federal courts based on diversity principles. Lastly, if the parties belong to the same state, their ability to seek federal court jurisdiction would not be appropriate under the diversity rule.

Thus, the key condition for establishing federal court jurisdiction based on diversity of citizenship is indeed that the amount in controversy exceeds $75,000.