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  2. List of decades, centuries, and millennia - Wikipedia

    en.wikipedia.org/wiki/List_of_decades,_centuries...

    List of decades, centuries, and millennia. The list below includes links to articles with further details for each decade, century, and millennium from 15,000 BC to AD 3000. Century. Decades. 15th millennium BC · 15,000–14,001 BC. 14th millennium BC · 14,000–13,001 BC. 13th millennium BC · 13,000–12,001 BC. 12th millennium BC · 12,000 ...

  3. Decade - Wikipedia

    en.wikipedia.org/wiki/Decade

    A decade (from Ancient Greek δεκάς (dekas) 'a group of ten') is a period of ten years. Decades may describe any ten-year period, such as those of a person's life, or refer to specific groupings of calendar years .

  4. Ninth Amendment to the United States Constitution - Wikipedia

    en.wikipedia.org/wiki/Ninth_Amendment_to_the...

    The Ninth Amendment (Amendment IX) to the United States Constitution addresses rights, retained by the people, that are not specifically enumerated in the Constitution. It is part of the Bill of Rights. The amendment was introduced during the drafting of the Bill of Rights when some of the American founders became concerned that future ...

  5. 9th century - Wikipedia

    en.wikipedia.org/wiki/9th_century

    e. The 9th century was a period from 801 (represented by the Roman numerals DCCCI) through 900 (CM) in accordance with the Julian calendar. The Carolingian Renaissance and the Viking raids occurred within this period. In the Middle East, the House of Wisdom was founded in Abbasid Baghdad, attracting many scholars to the city.

  6. List of years - Wikipedia

    en.wikipedia.org/wiki/List_of_years

    2.9 9th century. 2.10 10th century. 3 2nd millennium. Toggle 2nd millennium subsection. 3.1 11th century. 3.2 12th century. 3.3 13th century. 3.4 14th century. 3.5 ...

  7. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    Technological periods. Prehistory. Paleolithic (Lower, Middle, Upper) Mesolithic (Epipaleolithic) Neolithic. Chalcolithic (or "Eneolithic", "Copper Age") Ancient history (The Bronze and Iron Ages are not part of prehistory for all regions and civilizations who had adopted or developed a writing system.) Bronze Age. Iron Age.

  8. Millennium - Wikipedia

    en.wikipedia.org/wiki/Millennium

    Millennium. A millennium (pl. millennia or millenniums) is a period of one thousand years or one hundred decades or ten centuries, [1][2] sometimes called a kiloannum (ka), or kiloyear (ky). Normally, the word is used specifically for periods of a thousand years that begin at the starting point (initial reference point) of the calendar in ...

  9. List of U.S. states by date of admission to the Union - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._states_by...

    The following table is a list of all 50 states and their respective dates of statehood. The first 13 became states in July 1776 upon agreeing to the United States Declaration of Independence, and each joined the first Union of states between 1777 and 1781, upon ratifying the Articles of Confederation, its first constitution. [6]