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Most of the amendments describe the rights of American citizens. The first 10 amendments are called the Bill of Rights.
The similarities between the 20th and 21st centuries lie in innovations. The 20th and 21st centuries have been periods of great strides in technology and other areas.
12 of the 27 amendments were ratified during the 20th century. the amendment that took the longest to be ratified was congressional pay, passed in 1992 it took 202 years 7 months and 12 days to be ratified
The 18th Amendment was the establishment of Prohibition in 1920. The 21st Amendment repealed Prohibition on December 5, 1933.
Amendments 16-27 were all passed during this century: 20th.