The date of First Contact is one of the most pivotal moments in Star Trek canon, but Star Trek: Enterprise revealed a little-known truth that Vulcans actually landed on Earth in the 1950s, over 200 years before it. Although many aliens have visited Earth before Zephram Cochrane (James Cromwell) met the Vulcans in Star Trek: First Contact, it was meeting the pointy-eared race at a crucial moment in history that launched Earth on its destiny to become a galactic power.
https://screenrant.com/star-trek-enterprise-vulcans-earth-1957-first-contact/