The island of , by 1840, was the world's largest producer of sugarcane.

 Cuba

Explanation:

By mid 19th century Cuba succeed more than other Caribbean islands in sugar production because of its geography (plain terraines perfect for crops) and they also had better harvesting methods including steam engines, watermills, vacuum pans and enclosed furnaces, so production was high. Slavery stayed longer in Cuba compared to other Caribbean islands, which also contributed to their success.

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answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions