What is the term used to describe the situation when a person dies without a valid will?

The answer is intestacy.  it means that when a person dies and has property that is worth more than the total of their obligatory debts and funeral costs, with making a legal will or any compulsory declaration. This can also apply to situations where there is a will but is only applicable to a part of the estate while the rest of the estate becomes the intestate estate. Intestacy law also known as the law of descent and distribution decides who is eligible for the property from the estate under inheritance rules.

Yes you are cute answer theories to explain the colonization of the new world the last great habitable landmass to be occupied by humans focus on the bering land bridge, or beringia, which emerge by siberia and alaska the last ice age.