What legal principle protects the federal government from being sued in foreign courts?

Sovereign Immunity is the legal principle that shields the federal government and, in many instances, state governments from being sued in foreign courts without their consent. This principle acknowledges that a sovereign state cannot be compelled to answer legal complaints in another sovereign's court, thus preserving the respect for each state’s sovereignty and promoting diplomatic relations between nations.

Sovereign Immunity serves as a protection for governments to ensure that they can conduct affairs without the disruption that could stem from potential lawsuits in foreign jurisdictions. This principle is recognized in international law and serves to prevent interference in the internal matters of a state by other states.

The other concepts mentioned do not pertain specifically to the immunity of governments from being sued in foreign courts. Procedural Due Process relates to the rights of individuals to fair legal procedures, Conversion refers to the misappropriation of someone else’s property, and Unlimited Liability pertains to a business owner's full financial responsibility in case of losses, which does not apply to the context of government immunity in a legal sense.