Why could the corporation not remove the case to federal court in the situation described?

The corporation could not remove the case to federal court because it was a citizen of State A. For a case to be removed from state court to federal court on the basis of diversity jurisdiction, there must be complete diversity between the parties involved. This means that no party on one side of the case can be a citizen of the same state as any party on the other side. If the corporation is considered a citizen of State A, then it cannot remove the case from a state court in State A to a federal court, as it does not satisfy the requirements for diversity jurisdiction.

In this scenario, the other factors concerning federal jurisdiction or legal standing do not address the core issue of diversity. Even if the case were subject to federal jurisdiction or if an executive had standing, those points become moot if the necessary diversity is lacking. The condition of the federal court's caseload is unrelated to the basis for removal and doesn't impact the corporation's ability to seek federal jurisdiction under these circumstances.