You will be given a definition of a task first, then some input of the task.
This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: Colonial Lowcountry landowners experimented with cash crops ranging from tea to silkworms. African slaves brought knowledge of rice cultivation, which plantation owners cultivated and developed as a successful commodity crop by 1700. With the coerced help of African slaves from the Caribbean, Eliza Lucas, daughter of plantation owner George Lucas, learned how to raise and use indigo in the Lowcountry in 1747. Supported with subsidies from Britain, indigo was a leading export by 1750. Those and naval stores were exported in an extremely profitable shipping industry. Question: By what year was rice a successful commodity crop for the Lowcountry?
Output:
1700