Answer:
Travel across the US became much faster
Drivers could reach other cities quickly.
Aztecs,Ancient Egyptian's and SOME Native American's
Answer: bomb, cannon, bulldozer, and breaking a dam releasing a tsunami...
Explanation: the bomb: blowup the castle, the cannon: slowly destroy it with a hurdling pieces of concrete, the bulldozer: knocking it down, and the tsunami: floods the entire castle and breaking down most of it.
The event you're describing is called the Ra pe of Nanking. It happened in 1937. Around 50,000 innocent Chinese people were killed by Japanese troops.