The Greco-Persian Wars (also often called the Persian Wars) were a series of conflicts between the Achaemenid Empire and Greek city-states that started in 499 BC[i] and lasted until 449 BC. The collision between the fractious political world of the Greeks and the enormous empire of the Persians began when Cyrus the Great conquered the Greek-inhabited region of Ionia in 547 BC. Struggling to control the independent-minded cities of Ionia, the Persians appointed tyrants to rule each of them. This would prove to be the source of much trouble for the Greeks and Persians alike.
The reason is quite simple, this allowed them to monopolize the production and trade of silk and its trade. Because they were able to monopolize its production they could charge whatever price they wanted since they had no competition that would offer lower prices. This made them a lot of money and as they started developing the Silk Road they not only traded silk but several other products and even slaves between Asia and Europe.
The type of wave which needs a medium to travel are sound waves because they travel by oscillating electromagnetic fields
<h3>What is a Sound Wave?</h3>
This refers to the waves of refraction which is propagated by a plastic medium.
With this in mind, we can see that mechanical waves are the types of wave that needs a medium for propagation and a sound wave is an example of a mechanical wave because it travels by oscillating electromagnetic fields.
Read more about mechanical waves here:
brainly.com/question/9242091
To achieve his purpose, Jackson encouraged Congress to adopt the Removal Act of 1830. The Act established a process whereby the President could grant land west of the Mississippi River to Indian tribes that agreed to give up their homelands.
