Final answer:
John Rolfe's introduction of a new type of tobacco cultivation in Virginia led to the success of Jamestown.
Step-by-step explanation:
Jamestown succeeded after John Rolfe came back because he pioneered tobacco cultivation in Virginia. He introduced a smooth and sweet variety of tobacco from the Caribbean, which quickly became a popular cash crop in England and Europe. The profitability of tobacco led to the development of plantations and the need for a large labor force, which ultimately contributed to the growth and success of Jamestown.