Economic: Acquiring more land would've given more opportunity to current and future settlers. Reaching coast to coast would be better for trade, as well as getting people to settle in these areas with like the homestead act (easy to settle near sources of water and fertile land, rather than midwest)
Social: Manifest destiny is seen as a god given right to america at this point, each president that pushes it, believed and persuaded people into believing this. Reaching coast to coast is also a goal(Similar to like the moon landing) in its impact.
You can say that it is caused by the annexation of texas, mainly due to support for annexation began to form at this point. As well as their land disputes with britain, causing a rise in patriotism and the newly co'ined term 'manifest destiny'
Europe felt the impact of America's slump through lack of capital, less products were being bought from Europe by Americans, American investors weren't as active, etc.
NINBY stands for “Not in my back yard” and it represents a negative attitude of the people who opposed zoning and building developments for selfish reasons.
Blitzkrieg was so fast that the enemy didn't have time to prepare, whereas in WW1 where they fought in trenches, they would have to cross no-mans land and the enemy could see them coming
