During Bush's second term, the great recession hit, making the American economy very unstable. The unsteadiness of the economy stopped foreign investors from investing in American stock because they were uncertain if they would make their money back. For that reason, the international support of the United States dropped. its explaind a little better then his
I found that from April to mid-June there's an increase in the ground level ozone which creates smog (smog is created by the emissions from vehicles and smokestacks when they come in direct with sunlight.)
Nitrogen Dioxide (NO2) It comes factories, old cars from the 1900s, etc. it is a poisonous gas that comes from old engines can when breathed into the human body it can cause loss of fatigue, restlessness, anxiety, etc.. When it is released it gets stuck into the atmosphere but still gets stuck into the air but a small amount so little it can't harm large number of humans or animals.
Globalization increased international contact allows diseases to spread farther and faster.
To stop supplies going to Britain and France. I think. Hope i helped