The importance of the Chaco Phenomenon is to understand ancient civilizations and

For over 2,000 years, Pueblo peoples occupied a vast region of the south-western United States. Chaco Canyon, a major centre of ancestral Pueblo culture between 850 and 1250, was a focus for ceremonials, trade and political activity for the prehistoric Four Corners area.

Explanation:

the reasons congress passed the espionage and sedition acts during ww1 were: the purpose of the espionage act was to prohibit interference with military operations, to ban support of u.s. enemies during wartime or to promote insubordination in the military.