Why are elections to the senate staggered?

they are staggered because companies want to make sure representatives are controlled so that they don't try to take over or have more power over the rest of the people.

Explanation:

i looked all over the web and this is what I could come up with but tell me if I'm right

answer; the confederacy could afford to move a large number of prisoners hundreds of miles but could not afford to fee and house the prisoners;