World War I did have machine guns, so you can rule that one out.
Mustard Gas was used, so you can rule that out for poison.
Automobiles were used, so you can rule that out.
Aircrafts were just new in 1917 at the end of the first world war. They couldn't carry anything but a pilot.
So I would say Aircraft Carriers.
Answer:
a group of people of the same sex race and ethnicity
Answer:
the Mongols allowed free practice of religion whether it be Buddhism, Nestorian Christianity, Manichaeism, Daoism or Islam because this policy ensured an easier governance of conquered territories.
Southern states wanted new slave territories, while the north wanted to contain the spread of slavery. while western expansion contributed to growing sectional tensions between the north and south from 1800-1820
