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en.wikipedia.org/wiki/20th_century

The 20th century was a century that began on January 1, 1901 and ended on December 31, ...... "When and where did the new Millennium officially start, and why?". Archived from the original on 20 June 2012. Jump up ^ "The 21st Century and ...

en.wikipedia.org/wiki/21st_century

The 21st century is the current century of the Anno Domini era, in accordance with the Gregorian calendar. It began on January 1, 2001 and will end on December 31, 2100. ... In contemporary history, the 21st century essentially began in 1991 (the end of Short Twentieth Century) ...... This section does not cite any sources.

www.historylink.org/File/2012

Jan 1, 2000 ... On January 1, 1900, the twentieth century does not begin. Rather, this New Year's Day begins the last year of the nineteenth century.

www.quora.com/Why-are-the-1900s-called-the-20th-century-and-the-2000s-the-21st-century

First century started with first 1st year AD. 1st ,2nd ,3rd ,4th ..........100th years all counted in as ... Convention, since the system did not start with a First Century.

www.loc.gov/rr/scitech/battle.html

When does the century end? ...... 1 "... the 20th Century does not, cannot begin until the first second of the year 1901, or instantly after midnight on Dec. 31st ...

www.thoughtco.com/20th-century-timelines-1779957

Jul 31, 2017 ... The 20th-century began with without cars, planes, television, and of course, computers. These inventions changed the lives of Americans in this ...

www.nytimes.com/books/first/r/roberts-century.html

The twentieth century is properly the name for 100 years which began on 1 January ... to write essays on the question `When did the eighteenth century begin?'

www.digitalhistory.uh.edu/disp_textbook.cfm?smtid=2&psid=3176

The 20th century also witnessed a revolution in economic productivity. ... This did not include the growth in fringe benefits such as vacation, medical ... At the beginning of the century, 40 to 50 percent of all Americans had income levels that  ...

www.scholastic.com/teachers/articles/teaching-content/twentieth-century-society-united-states

20th-century industrial growth and progressive reform in America. ... The beginning of the 21st century seems a suitable time to look back over the past 100 ... The Progressive movement did little else for women, however, and even less for ...