Final answer:
J.P. Morgan was the captain of industry who was able to lend the U.S. Treasury money due to his significant wealth.
Step-by-step explanation:
The captain of industry who was so wealthy he was able to lend the U.S. Treasury money was J. P. Morgan. As the founder of J.P. Morgan & Co., he accumulated significant wealth through his banking and investing ventures. His wealth gave him the ability to lend money to the U.S. government during times of financial need.
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