Who gets half?
Run your own split. Pick a state, enter what the two of you have built up while married, and see what half looks like, in $1 bills if you like.
How the 50/50 states work
Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington and Wisconsin are community-property states. What either spouse earns during the marriage generally belongs to both of them, half each.
What each spouse owned before the marriage, plus gifts and inheritances, is generally separate property and isn't split. A prenup or postnup can change all of this.
Every other state divides marital property "equitably." A judge weighs things like the length of the marriage and each spouse's finances, and the result isn't always half.
Source: IRS Publication 555, Community Property. This is a rough illustration, not legal advice. A family lawyer in your state can tell you what applies to you.