It's not just the United States. The following countries governments have all disclosed they collected and studied UFO/UAP events for years. They have also disclosed records to support their studies.
Argentina, Australia, Brazil, Canada, Chile, China, Denmark, Finland, France, Germany, India, Ireland, Japan, Mexico, New Zealand, Peru, Russia, Spain, Sweden, Ukraine, United Nations, United Kingdom, Uruguay, and Vatican City(!) have all acknowledged organized study programs and collecting documented events. It just isn't the United States.
You'll notice the United States has not yet elected to participate in the disclosure project and have maintained secrecy over much of their troves of documents.
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