The correct answer is: An asteroid impact.
The scientists call it the extraterrestrial impact theory. It states that a giant, six mile wide meteor hit the Earth around 66 million years ago. As a consecuence, clouds of iridium dust and other materials were thrown into the air, blocking the sunlight for years. This lead to the extintion of the dinosaurs who were not able to feed themselves as plants didn't grow. Photosynthesis was not possible and food chains could not be completed. When the dust settled the greenhouse gases were locked in the atmosphere causing a general increase of temperature.
The American society emerged in the years that followed World War II as the world's most productive and affluent society. Dramatic demographic changes that have resulted throughout the country as a result of a booming economy and a "baby boom".
The banking system is crucial for the functioning of the US economy because they make loans and create credit. Without loans many people wouldn't be able to buy a house or a car, and the economy would collapse. Government regulates the banks to make sure they are being fair to their clients.
<span>The most dramatic change in agriculture in the South was the invention of the cotton gin.
True </span>
He created the league of nations
