[Answer] What is the only state to have its two-letter postal abbreviation changed since the current system was adopted?

Step 1 : Introduction to the question "What is the only state to have its two-letter postal abbreviation changed since the current system was adopted?"

...When the United States adopted the standardized two-letter postal abbreviation system on July1, 1963, Nebraska was initially assigned “NB.” However, this abbreviation created confusion with New Brunswick, a Canadian province that also used “NB.” To avoid postal mix-ups, the U.S. Postal Service changed Nebraska’s abbreviation to “NE,” making it the only state to have its official two-letter code revised after the system was implemented. This change helped ensure clarity in mail delivery and international correspondence.

Step 2 : Answer to the question "What is the only state to have its two-letter postal abbreviation changed since the current system was adopted?"

Nebraska:

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