I believe it's C. Skilled Labor.
Answer:
It shows its effects in many different ways !
Explanation:
In some parts of the world, populations declined as a result of increased global contact. The transfer of European diseases, such as smallpox and measles, decimated many Native American populations. Other populations were wiped out as a result of conflicts.
Imperialism made United States grow there is new technology new factories new jobs and new inventions.
