Among the key changes brought by the Hart-Celler Act: Quotas based on nation of origin were abolished. For the first time since the National Origins Quota system went into effect in 1921, the national origin was no longer a barrier to immigration.
The cotton gin changed the textile industry by making cotton far easier to sort, greatly increasing the output of available cotton and therefore causing the price to drop. The cotton gin works by separating the cotton fluff that will be made into fabric from seeds and dirt. Previously, picking these seeds out of cotton took a great deal of time and energy, but the invention of the cotton gin in 1794 sped up the process, allowing farms to produce far more cotton and increasing the amount of cotton available for making clothing.
Italian was not the official language of the Roman Empire and therefore is not a legacy, so this would be the incorrect answer. During the Pax Romana, there were many key inventions such as the systems of roads, tunnels and bridges being created all over the empire. Aqueducts were one of the biggest inventions, with some of them still working today. The achievements made in law during that time are still used for Civil Law today.
<span>There are such great differences in the wages and salaries paid to different people because a worker's human capital is the greatest determinant of his or her wage or salary. Each person's human capital is valued according to the amount of education and training that person had throughout their life. So it is only natural that a person with two PhDs should have a higher salary that those who've only finished high school. </span>
The West Indies was what the islands are sometimes called to this day, this came from the (false) belief that Columbus has discovered Asia/India.
