Meaning of 1820s

1. The Industrial Revolution began to gain momentum in the 1820s.
2. The United States experienced rapid westward expansion during the 1820s.
3. Many important literary works were published in the 1820s, such as "Frankenstein" by Mary Shelley.
4. The first modern railway system was developed in England in the 1820s.
5. The first photograph was taken in the 1820s by Joseph Nicéphore Niépce.
6. The Greek War of Independence against the Ottoman Empire began in the 1820s.
7. The first modern sewing machine was invented in the 1820s by Barthelemy Thimonnier.
8. The Monroe Doctrine, which expressed American opposition to European colonization in the Americas, was issued in the 1820s.
9. Beethoven composed some of his most famous works, including his Ninth Symphony, in the 1820s.
10. The first steam-powered locomotive was built in the 1820s by George Stephenson.