Throughout this period, in a policy that continues to this day, the government has given preferences to professionals like doctors, nurses, scientists, and hi-tech specialists, creating what is often called the ".

Brain Drain

Explanation:

Brain drain was a term that is often used by the Immigration department. It refers to the type of people that often had priorities to obtain a green card. The government tend to believe that the Brain Drain groups contribute more to the Nation's economy compared to other occupations.

Jobs that considered as 'Brain Drain' tend to be the jobs that require high mental capacity and often time require long period of training before can be considered as a professional such as doctors, nurses, scientists, and hi-tech specialists,

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.