The Dust Bowl was caused by farmers in Texas and Oklahoma over-plowing and not rotating crops, which killed the topsoil and turned it into sand. During the 1930s, strong dust storms carrying tons of topsoil regularly engulfed the region, sometimes reaching as far as New York and Washington D.C. The dust storms were so severe that they could knock down light poles and leave streets covered in thick layers of sand. Many families were forced to migrate to California to escape the Dust Bowl conditions, while others who remained grew poorer and had to constantly repair their damaged homes and structures after each storm.