powers not explicitly reserved for the federal government are given to the state's
The commune in Roxbury, Massechusets.
The house of reps changing due to the change in population in each state which is measured every few years
I believe the correct answer is similar tools and remains.
Based on the tools and remains that are rather similar in all of the Clovis sites, the archaeologists can see certain connections between the people who lived there many many years ago given that they used similar tools so they must have been connected somehow.