"United States I-IV"

"United States I-IV" likely refers to a classification system for different administrative or operational regions within the United States, possibly indicating levels or phases in a process, zones, or categories distinguished by Roman numerals I through IV. Such designations are often used in contexts like emergency response levels, administrative divisions, or project phases. Without specific context, it generally signifies a structured hierarchy or segmentation within the U.S., with each Roman numeral representing a distinct stage, area, or classification. Clear understanding depends on the particular field or document where this labeling is used.