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.
Answer:
I believe it is because it was expensive, and the U.S was independent from Texas. Mexico also held the west coast, and pretty much everything was in Kaos, because Texas Independence.
Explanation:
Mexico held what is now known as Arizona, California, New Mexico, Texas, Colorado, Nevada, and Utah, which is pretty bigg.
Mexico and Texas wasn't getting along, and the U.S was slightly supporting the U.S so that didn't go over so well.
President Houston tried to smooth things over with Polk, but Lamar kinda went banzai and attacked everything and tried to Manifest Destiny Texas instead of the U.S, and Lamar hated joining the U.S, and Mexico said that if Texas joined the U.S, "Texas + U.S = war." which kinda blew up into war.
I believe it's Donald trump
