Two of the main reasons for Truman's policy of containment during the Cold War were that the USSR was trying to rapidly expand, and that eliminating communism where it already existed was extremely unlikely. It was considered a very effective policy originally but then was viewed with skepticism when Vietnam hit.
I’m not 100% sure but I think the answer your looking for is that they gained more than 500,000 square miles of land
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Controlling fire is important because not doing so can cause even more catastrophic damage than has already been done. Take California historically, for example. In the past, they've had millions of acres destroyed by wildfires, and that was while they were being contained. Imagine if they weren't, How much more *could* it have done?
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Explanation:because of chemical
Many settlers were willing to leave their homes and head west due to the dream of attaining a better life, usually thinking of the possibility of acquiring free or cheap land. Other ocassions were for example, the "gold rush" in which so many went to California in search of gold. Others went west hoping to find more freedom.