Airplanes and chemical warfare were technological advances during world war 1.
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immigrants became indentured servants at their own will and slaves were forced and had no choice.
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I think the answer is warrior.......
Yellow journalism was a style of newspaper reporting that emphasized sensationalism over facts. It very much helped push the United States and Spain into war in Cuba and the Philippines. Which lead to the acquisition of overseas territory by the US.
brow,central,cold,eastern,european i hope this helps