None - Barack Obama was the first black president.
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Answer:
A.) It helped them find their way to new countries by land and water
Answer: Reduction in labor shortages(D)
Explanation:
Migration is the movement of people from one geographicsl area to another. It could be the movement of people from one country to another or from one state to another.
Migration can lead to the disagreement between different religious groups. Due to the influx of people into an area, there can be religious conflicts when the people share different opinions regarding their religion.
Migration can also lead to increase in the cost of health care. As there are more people in the state, there'll be more cases of sick people or people who need medical attention. Migration can also lead to overcrowding in cities because of the larger number of people.
Reduction in labor shortages is an advantage of migration. Migration means there'll be more labor supply and firms can employ the available workers. This will lead to labor shortages.
