Answer:
The Awnser is: The African Slave Trade.
I hope this helps you out :)
A. Is the answer so A. Demographics
The correct answer to this question is Japan bombed the Pearl Harbor. The time when Japan bombed the Pearl Harbor got the United States to finally enter the war. Although the war has begun with the Germany's invasion of Poland, the United States agreed to stay out of it. However, everything changed on December 7, 1941, a date that every American will never forget.