Answer:why do i keep getting these ones with past due dates???
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African Americans,they wondered if independence would lead them to the end of slavery.
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machine guns and poisonous gases
Explanation:
these things advanced WWI because at the time, military did not have access to these, thus defeating people took longer. With toxic gases, you can kill someone faster without them knowing if it didn't have a smell. They were more advanced other wars because they weren't as advanced.