Answer:
All weapons helped soldiers to defend more effectively
Answer:
Artificial intelligence such as Robots
Explanation:
In 18th century, slavery was at peak value since there was high need of labour.
In 20th century, scientists have created robots which has replaced slaves hence slavery decayed.
The smallpox epidemic in 1721 spread between 5,889 Bostonians and 844 died of it. October was the worst month, with 411 deaths
