Tyre<span>, </span>Sidon, <span>Byblos and Arwad</span>
There are no options given, but historically speaking it was the invention of "Cotton Gin".
A cotton gin was a revolutionary invention which enabled people to
easily separate cotton fibers and seeds; previously it used to take a large
time sorting it manually. The inventor behind this was <span>Eli Whitney. The processing was made easy but
still slaves were needed to grow cotton.</span>
Answer:
Immigration policies refer to a national sphere because it affects the country as a whole, so all changes and the formulation process of an immigration policy must come from a national sphere and the whole country needs to live by these laws and policies.