William Cullen Bryant is said to be The first native American poet to gain worldwide fame How to understand this

This means that William Cullen Bryant was the first American poet to achieve fame and recognition not only in America, but also in other parts of the world. He was known for his literary works and poetry, which were appreciated and admired by people from different countries. This recognition helped establish American literature on the global stage and paved the way for other American writers to gain international recognition.