The effort from the US, UK and Canada to develop nuclear weapons was known as the Manhattan Project.
Answer:
The territories of Kansas and Nebraska were opened to settlement, thereby rejecting the Missouri Compromise of 1820 by enabling white male residents in those regions to decide whether or not to allow slavery through popular sovereignty.
Because they felt like they had more of a voice when that came upon. They also felt more important
They thought they could benefit from the area's warm climate and fertile soil.
