If it like a money budget then it’s giving you a maximum/limit on what you can spend on something
For example:
If someone was about to go to the shops and they gave themselves a budget of £/$ 200 they could only spend £/$200 or less
The West, The North, and The South.
If you look at a map under the title sectionalism, you can see just how American's sectionalized the United States. The West was typically the area in which Manifest Destiny aimed to conquer while the South and North were divided by slavery.
Hope this helps!