What is the leading theory about how early humans arrived on the american continents?

Which describes a domestic policy for which president nixon was responsible? the reduction of tension between the democrats and republicans the establishment of the second frontier the reduction of tension between the united states and china the establishment of the environmental protection agency

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.

Which of these is an edge city? boston, ma chicago, il irvine, ca detroit, mi