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  Columbus left Castille with three ships in August 1492, and came to the Americas on October 12th of that year (Wikipedia).
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  "A modern mechanical cotton gin was created by American inventor Eli Whitney in 1793 and patented in 1794" (Wikipedia).
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  The telegraph was patented in 1837 by Sir William Fothergill Cooke and Sir Charles Wheatstone (britannica.com).
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  "The 13th (1865), 14th (1868), and 15th Amendments (1870) were the first amendments made to the U.S. constitution in 60 years" (courses.lumenlearning.com).
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  Edison patented the electric light bulb in 1879 and 1880 (energy.gov). The telephone was patented in 1876 (elon.edu). The Wright Brothers created the first working airplane in 1903 (airandspace.si.edu).
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  The Homestead Strike was in 1892, and the Pullman Railroad Strike was in 1894 (projects.vassar.edu).
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