Answer:
ExplanationThe three-age system is the periodization of history into three time periods;[1][better source needed] for example: the Stone Age, the Bronze Age, and the Iron Age; although it also refers to other tripartite divisions of historic time periods. In history, archaeology and physical anthropology, the three-age system is a methodological concept adopted during the 19th century by which artifacts and events of late prehistory and early history could be ordered into a recognizable chronology. It was initially developed by C. J. Thomsen, director of the Royal Museum of Nordic Antiquities, Copenhagen, as a means to classify the museum's collections according to whether the artifacts were made of stone, bronze, or iron.
National defense may be at risk due to free trade
The Open Door Policy of trade by the U.S. related to
Answer: A. China
B, The Spanish and the Native Americans borrowed language, foods, and customs from each other is the correct answer :)
