Uranium-238 decays very slowly, with a half-life of 4.47 billion years. what percentage of a example of uranium-238 would remain after 13.4 billion years

The north american colonies experienced a steady increase in population since the first settlement in jamestown in 1607. by 1775, the colonies' population was around 2,500,000, and most of the colonists lived east of the allegheny mountains. how did geography influence the settlement of america's first colonies?