Possibly the telegraph. Morse code came into place with that. People could communicate with ticks.
Answer:
Iron, small arms, cannons, saltpeter, gunpowder, knowledge, resolution, hath, and courage.
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Answer:
cities like Timbuktu and Gao into important cultural centers. He also brought architects from the Middle East and across Africa to design new buildings for his cities. Mansa Musa turned the kingdom of Mali into a sophisticated center of learning in the Islamic world.
Prior to the Qing Dynasty, China had resisted foreign influence because they "were geographically too hard to reach" since many mountain regions provided protection.
The slaves were promised freedom if they fought for the British. It is known that Black men enlisted at a higher rate than white men. Most free blacks fought for the Patriots.