Columbia Encyclopedia

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class="we-mega-menu-li" title="" href="/us/race" target=""> Race & Ethnicity </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="7681b583-1195-42e1-a3ce-91f80e657ed5" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/us/states" target=""> States </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="59e82755-eb02-450d-81cf-dd9e5d00fd6f" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/us/us-statistics" target=""> Statistics </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="78a597de-29f1-4bc8-b0a7-6ed1c8e90bf2" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/culture-entertainment" target=""> Arts & Entertainment </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" 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data-id="4b93647c-84fc-4a69-99c9-a421fd7559b4" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history" target=""> History Overview </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="c56361ab-8d10-4c0c-83c7-251a5eb04a38" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/timeline-archive" target=""> Timelines </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="f6bdbafb-edc7-4fe9-b578-9cca0babbf51" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history/world" target=""> World History </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="7e9ce0c4-b34d-4021-a9a1-51b6f26f2a3f" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history/us" target=""> U.S. History </a> </li><li class="we-mega-menu-li" 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data-hidewhencollapse="0"> <ul class="nav nav-tabs subul"> <li class="we-mega-menu-li dropdown-menu we-mega-menu-group" data-level="1" data-element-type="we-mega-menu-li" data-id="823c9906-9f40-4c10-8bb9-57da2519a641" data-submenu="1" hide-sub-when-collapse="0" data-group="1"> <span data-drupal-link-system-path="<front>" class="we-megamenu-nolink">Math & Science<i class="arrow down"></i></span> <div class="we-mega-menu-submenu" data-element-type="we-mega-menu-submenu"> <div class="we-mega-menu-submenu-inner"> <div class="we-mega-menu-row" data-element-type="we-mega-menu-row" data-custom-row="0"> <div class="we-mega-menu-col span12" data-element-type="we-mega-menu-col" data-width="12" data-hidewhencollapse="0"> <ul class="nav nav-tabs subul"> <li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="ad31b703-5dfd-4ea0-bea2-52aff8db39cc" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/math-science" target=""> Math & Science Overview </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="a924bf45-ec7b-4870-97a9-fc046d125d37" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/math-science/aviation" target=""> Aviation </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="0b4e7ad8-b50a-469c-934a-2f3e129fe476" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/math-science/biology" target=""> Biology </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="5d21d31e-4f9b-4610-8779-69692b65c49d" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/math-science/computers-internet" target=""> Computers & Internet </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="789f214d-109b-4b6a-8084-75bbc0aa448d" data-submenu="0" 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href="/math-science/weights-measures" target=""> Weights & Measures </a> </li> </ul> </div> </div> </div> </div> </li><li class="we-mega-menu-li dropdown-menu we-mega-menu-group" data-level="1" data-element-type="we-mega-menu-li" data-id="29a78c62-ce20-4f1e-bb70-da47b92141ae" data-submenu="1" hide-sub-when-collapse="0" data-group="1"> <span data-drupal-link-system-path="<front>" class="we-megamenu-nolink">Calendar & Holidays<i class="arrow down"></i></span> <div class="we-mega-menu-submenu" data-element-type="we-mega-menu-submenu"> <div class="we-mega-menu-submenu-inner"> <div class="we-mega-menu-row" data-element-type="we-mega-menu-row" data-custom-row="0"> <div class="we-mega-menu-col span12" data-element-type="we-mega-menu-col" data-width="12" data-hidewhencollapse="0"> <ul class="nav nav-tabs subul"> <li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="7ebfbf4a-de2b-460b-930f-1928372833d7" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/calendars" target=""> Calendar & Holidays Overview </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="4411d1bf-0883-4267-8759-11614e0f285f" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/calendars/history" target=""> Calendars </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="d76efcb5-a742-4b6a-b14d-217d6d76e9ca" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/culture-entertainment/holidays" target=""> Holidays </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="56cc31b3-222b-448a-bf5c-bd325334323d" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/calendars/months-seasons" target=""> Seasons, Months, Days </a> </li><li class="we-mega-menu-li" data-level="2" 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href="/business/consumer-resources" target=""> Consumer Resources </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="757bd3fa-14b6-4466-8e1f-4d6277557bc9" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/business/money" target=""> Currency </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" description="Economy" data-id="afe3b0e4-dbb8-48db-823f-833990412195" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="Economy" href="/business/economy" target=""> Economy </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="d71a21f6-4513-4b0b-85e3-7536e3c8abb1" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/business/labor" target=""> Employment & Labor </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" description="Personal 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