The oldest known version of the cross, dating back to prehistory and found all over the world, including among the Native Americans, is the swastika5 .
我们所知最古老的十字形形式，这个形式可以追溯到史前时期，而且在世界各处都有，包括美洲土著印第安人。
(Li Liu) Diffusionism and the Transoceanic Contacts -- the Debate on Cultural Contacts between the Old World and the New World in American Archaeology. Shiqian Yanjiu (Prehistory). 1: 81-84.
（刘莉）《传播论与横渡大洋之接触—美国考古学界关于新旧大陆之间文化传播问题的争论》，《史前研究》1：81-84。
(Li Liu) Diffusionism and the Transoceanic Contacts -- the Debate on Cultural Contacts between the Old World and the New World in American Archaeology. Shiqian Yanjiu (Prehistory). 1: 81-84.
（刘莉）《传播论与横渡大洋之接触—美国考古学界关于新旧大陆之间文化传播问题的争论》，《史前研究》1：81-84。
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