Why This Huge Part Of America is Almost Empty?

Have you ever wondered why so few people live in the middle of United States? Often referred to as the "Heartland" or "Flyover States". Why is there a large belt down the middle that is almost entirely empty? #usa #america #unitedstates #midwest #population #westside #eastside #westcoast #eastcoast #california #newyork #losangeles #chicago #sanfrancisco #texas #iowa #wyoming #greatplains #yellowstone #rockymountains #nebraska #alaska #montana #maine #virginia #delaware #massachusetts #rhodeisland #vermont #newhampshire #idaho #oklahoma #atlantic #pacific #ocean #map #maps #density #washington #pennsylvania #newjersey #florida #tennessee #newmexico #michigan #wisconsin #arizona #nevada #louisiana #alabama #mississippi #missouri #georgia #northamerica #northcarolina #southcarolina #oregon #southdakota #northdakota #kansas #kentucky #illinois #indiana #westvirginia #connecticut #maryland #colorado #utah #hawaii #minnesota