According to posts found on X, there have been claims that Donald Trump, as the 47th President of the United States, has renamed the Gulf of Mexico to "Gulf of America." Additionally, there are mentions of Google Maps updating their maps to reflect this change, supposedly following an order from Trump. However, these claims should be treated with caution:

Gulf of America: The renaming of the Gulf of Mexico to "Gulf of America" has been mentioned in various posts on X, with announcements from different sources like Fox Business, RSBNetwork, and others, suggesting this was part of a directive by President Trump. However, these social media posts alone do not provide conclusive evidence of such a change in official geographical nomenclature. This would typically involve international recognition or at least official statements from relevant U.S. government departments, which have not been referenced here.

Holiday Declaration: There is no specific mention in the provided X posts about a new holiday being declared by Trump. Thus, without further information or official announcements from government sources, this part of your query remains unconfirmed.

Analysis:
Source Reliability: Social media, particularly X posts, can be a source of misinformation or premature announcements. Official government actions or changes, especially those of this magnitude, would typically be accompanied by official press releases, legislative actions, or announcements from the White House, which are not referenced here.
Political Context: Such actions could be seen as symbolic or political moves, aligning with nationalist sentiments or as part of a broader policy to reclaim or redefine American identity or geography. However, without broader context or confirmation, these remain speculative.
Global Impact: Changing the name of a significant body of water would have international implications, requiring diplomatic discussions or at least acknowledgment, which isn't evident from the given information.

To get a more definitive answer on whether these changes have been officially enacted:
Check official government websites, news outlets with a reputation for fact-checking, or international news sources for corroboration.
Look for statements from the U.S. Department of the Interior or similar bodies responsible for geographic names.

Remember, while X can provide immediate insights into public sentiment or early reports, it's crucial to seek out verified information from multiple, credible sources when discussing official changes in policy or geography.