"To combat the great depression an infrastructure of interstates, connecting all the lower 48 United States, was built."
ru0ster , people began planning for a network of highways in 1921, nearly ten years before the Great Depression of the 1930's. The legislation authorizing the Interstate Highway System in the Untied States was passed in 1956, over 15 years after the Great Depression had ended. The Interstate Highway System has no connection with the Depression.History has a habit of repeating itself because human beings too often ignore facts.   See 3 other replies

""An asteriod impact with a large body of water, ejecting liquid water into the lower stratosphere, encircling the planet, coming back down as large frozen balls of ice (basketball sized), creating a very thick layer world wide""--Stephen W-- ^^I have never heard this explanation for an ice age(s) in my life. Global Snow ball hail? Glaciers can naturally grow enormous and almost encapsulate all of North America without invoking alien planetoids, but for a whole earth ice-cap , we need a Asteroid making it snow big-snowballs. Im sure if ice ages had knobs, they would all go to 11 when needed and none have big red asteroid buttons. Although impact debris could trigger a runaway cooling cycle --causing an "iceage", big snowballs falling and covering the earth sounds, well silly.   See 7 other replies