Native Americans experience historical trauma through the effects of colonization such as wars and battles with the U.S. military, assimilation, forced removal, and genocide.
Allied forces had found so much of destruction when they reached Germany at the final stage of war because they have found German cities and factories have been destroyed by the Allied Bombing campaign. ... In 1945, allied forces surpassed the Rhine river and stepped on the mid of Germany
The Battle of Gettysburg was a turning point in 1863 for the North, During the American Civil War Between the North (Union) and South (Confederacy)
They do chemical examination to see how old is an artefact. Also based on previous objects, which were already dated by using a comparison can be determinated if the object is newer or older.
In addition, the scientist dig all the time so based on the excavations they make a thesis about what the live in this place was. If the same objects are found in another country for example , that means this people have traveled.. etc
C nephew is the answer hope it helps:)