Celluloid the first systetic plastic.
The reason the U.S. was hesitant about entering, is that they were just getting out of the depression, and they did not want a repeat of what happened <span>to them after WWI.</span>
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number 1 traded their manufactured goods with settlers.
Answer:
because of adulteration which is the cheapening of products through the addition of impure or inferior products. This helped in determining what could or could not be added to food products through regulations that require use of official weights and measures.
