The settlement of the Americas is widely accepted to have begun when Paleolithic hunter-gatherers entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the Last Glacial Maximum
“The soldiers tried to get into the enemy demilitarized zone to free the civilians.” A demilitarized zone is an area that is taken over my an army or military.