Oregon is not a "community property" state. Assets and debts are divided "equitably" by agreement OR by the court. This means there will be a fair division under the particular circumstances of a marriage. Some spouses agree on the division of marital property, assets and debts others don’t. If there’s no marital property agreement, the court will divide the property after looking at a number of factors e.g.,

Assets, debts and financial condition of each spouse
Business value, business interests, and self-employed spouses
Value of retirement accounts, 401(k)s, pensions, stocks and bonds
Trusts, life insurance trusts, and family limited partnerships
Future financial needs and liabilities of the parties
Liquidity and tax consequences
Contribution to the education or earning power of the other spouse
Contribution to the value of the marital property
Premarital and prenuptial agreements, separate property, gifts and inheritance
Spousal maintenance or alimony obligations