The period outside the quotation marks is not a copy error. For at least two centuries, it has been standard practice in the United States to place commas and periods inside of quotation marks.
A: The cotton gin was invented by Eli Whitney in 1794. It revolutionized the cotton industry in the United States but became a controversial invention as it b... Full Answer >
Eli Whitney invented the cotton gin to revolutionized the cotton industry in the United States. Prior to his invention, farming cotton required hundreds of man-hours to separaâ¦te the cottonseed from the raw cotton fibers.