The US joined in: December 7, 1941.
Fresh cheap land. They wanted to farm and take advantage of the terrain .
Ecology is the study of interactions between the environment and living creatures.
Explanation:
All of the wonders on the list are UNESCO World Heritage sites and were chosen by an online poll of tens of millions of votes in 2007. If you couldn't name all seven (but hopefully now you can), then naming the Ancient Seven Wonders of The World could prove even more difficult
Answer: Culture
Explanation: Because of these shared beliefs, these people have maintained and sustained their ways of life.