What event led to the Spanish deciding to build a wall around the city of St. Augustine?

The Spanish decided to build a wall around St. Augustine in response to threats from British colonial expansion and increasing tensions in the region. The city's strategic location made it vulnerable to attacks, particularly after the British captured nearby territories. The construction of the wall, completed in the late 17th century, aimed to fortify the settlement and protect it from potential invasions, securing Spanish interests in Florida.