In what year were U.S. state abbreviations standardized?

Here is the question :

IN WHAT YEAR WERE U.S. STATE ABBREVIATIONS STANDARDIZED?

Here is the option for the question :

• 1854
• 1911
• 1963
• 2000

The Answer:

And, the answer for the the question is :

Explanation:

[STC005926] A number of innovations that simplified the process of shipping parcels were introduced in 1963, one of which was the use of five-digit ZIP codes. In June of that year, the USPS proposed a series of state abbreviations, though many had three of four letters. The United States Postal Service reached a consensus in October regarding a set of two-letter abbreviations that are still in use today.