Final answer:
Samuel Slater had a negative impact on the British textile industry by bringing the plans for English textile mills to the United States and establishing the first successful water-powered cotton mill in Pawtucket, Massachusetts.
Step-by-step explanation:
Samuel Slater had a negative impact on the textile industry in Britain because he brought the plans for English textile mills to the United States. This led to the establishment of the first successful water-powered cotton mill in Pawtucket, Massachusetts, which competed with and affected the British textile industry. The success of Slater's mills and the subsequent establishment of more mills in New England led to a decline in the British textile industry.