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Uniforms of Argentina (War of Independence 1810-1824) -part I

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General Don Jose de San Martin, Liberator of Chile and most of Peru.
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This is a collection of uniforms of Argentinean officers and regular troops during the Spanish-American Wars of Independence 1810-1824, that is the standing troops of the independent United Provinces of Rio de la Plata as well as the Argentinean troops of Gen. José Francisco de San Martín who gained independence for Chile and most of Peru.

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Ancestors of Native Americans migrated in single wave, genetic study finds

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Reblogged/ Source: news.ku.edu/2015/07/21/ancestors-native-americans-migrated-single-wave-23000-years-ago-genetic-study-finds

LAWRENCE — A new genome-scale study that includes a University of Kansas anthropological geneticist has determined ancestors of present-day Native Americans arrived in the Americas as part of a single-migration wave from Siberia no earlier than 23,000 years ago.

Later migrations of Aleuts and Eskimos occurred approximately 9,000 and 4,000 years ago.

“Using coalescence analyses, not just using one piece of DNA, but the entire genome, we find that the earliest someone could have come to the Americas was 23,000 years ago,” said Michael Crawford, head of KU’s Laboratory of Biological Anthropology and a professor of anthropology. “This study also pretty well does in the whole idea that gene flow from Europe contributed to the original migration of present-day Native Americans.”

Crawford is a co-author on the study, and the journal Science has published its results online. The Center for GeoGenetics at the University of Copenhagen headed the international research team, which included co-authors Eske Willerslev, a Lundbeck Foundation professor at the center in Copenhagen; Maanasa Raghavan, a postdoctoral researcher at the center; Yun Song, a professor of electrical engineering and computer science, statistics and integrative biology at University of California, Berkeley; and David Meltzer, an anthropology professor at Southern Methodist University, among others.

To more accurately pinpoint the account of how and when modern humans populated the Americas from Siberia, the team generated genomic data from several present-day and past Native American and Siberian populations. This included an analysis of the DNA of the fossil known as Kennewick Man, found along the Columbia River in Washington State in 1996.

“This is not just mitochondrial DNA,” Crawford said. “It’s shown on the entire genome that’s been sequenced.”

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