In the ancient world, why did civilizations flourish around great river valleys? River valleys protected citizens from natural disasters.
River valleys provided an ideal environment for agriculture.
River valleys sheltered citizens from harsh weather.
River valleys contained vast mineral
resourges

Which purposes of the constitution are found in the preamble? select the six correct answers. to provide for the common defense to form a more perfect union to promote the general welfare to secure the blessings of liberty to declare independence from britain to establish justice to ensure domestic tranquility