Answer:
railroads made resources and products easier to transport. The US government gave land to the railroads to help them expand. … Trains from different rail lines could use each other's tracks.
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Answer: 1920- Hair Dryer
1920- First radio station
1920- The Thompson Sub-Machine Gun
1920- The Band Aid
1921- First robot built
1923- Traffic Signal
1925- Mechanical Television
1926- Liquid Fueled Rockets
1928- Penicillin
1929- Car radio
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Answer:
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