The completion of transcontinental railroads in the United States and Canada
I think it is b because i know all other sources can be a freshwater ecosystem and swamps have a freshwater and salt water kinds so ya
Answer:In 1794, U.S.-born inventor Eli Whitney (1765-1825) patented the cotton gin, a machine that revolutionized the production of cotton by greatly speeding up the process of removing seeds from cotton fiber. By the mid-19th century, cotton had become America's leading export.
Explanation:
I think you really liked the picture
Joan of arc introduced new battle strategies and incorporated older ones to succeed in 9 out of 13 of her battles in the 100 year war
