A fan because in the west it is near the equator which is really hot so the fan changed a lot and air conditioning
We changed the world. we literally fought and won, but even at that we still go through hardships. i think it's different because of the impact and the diversity!
Answer:
foreign exchange
They gain advantage because of foreign exchange
The machine guns were introduced in the 1800s so when the investors tested out the machine guns and it got hot they cooled it off with some sort of water filled jacket or else the gun would be shattered hoped it helped