According to recent market trend data, artifacts from which military conflict have seen the highest average price increase among collectors over the past decade?

The market for military memorabilia and collectibles has evolved significantly over the decades. Different conflicts and historical periods generate varying levels of collector interest, with certain eras dominating the market. Test your knowledge about current trends in military history collecting and which war period's artifacts are experiencing the most significant price growth in recent years.

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American Civil War
World War II
Vietnam War
World War I