Yes, it is true that early humans had to endure changes in climate and environment, since things like global warming and cooling, along with major events like the Little Ice Age, meant that the temperatures in the world were changing dramatically.
It was because they were inspired by the renewed interest in Greek and Roman culture.
Answer:
1- The addition of Texas added to the happening to the Mexican-American War
2- The contention began, to a limited extent, over a contradiction about which waterway was Mexico's actual northern fringe: the Nueces or the Rio Grande
Explanation:
The fundamental driver of the war was the affirmation of Texas into the United States of America. Since Mexico didn't perceive Texas' freedom after their effective resistance to the Mexican government it was viewed as an intrusion into Mexican domain once Texas acknowledged the greeting into the United States.
The primary drizzling affair was the attack of Poland by Nazi Germany on September 1, 1939, and the following words of war on Germany. Made by Britain and France, but many further previous events have been suggested as leading reasons.
The United States kept to itself because it was following an isolationist policy at the time
