The answer is A because it makes the most sence
Answer:
Higher wages
Explanation: This question is attempting to explain the reasons for migration. Push and pull factors play a role in the decision of human beings to leave one place or country and migrate elsewhere.
B.
The US never declared war on Germany because of the Poland invasion. Britain and France declared war on Germany because of the Poland invasion.
The United States was having the most problems with Japan, and the US declared war on Japan shortly after they bombed Pearl Harbor.
Once the US declared war on Japan, Germany declared war on the US due to the Tripartite Pact.