This handmade sign warned drivers that the road was impassable. (The sign maker wasn't a good speller!) Before hard-surfaced roads, Iowa's dirt roads became a sticky, muddy quagmire.
How has the shift from railroads to trucks for transporting goods changed Iowa? How has it changed the country?
Media Artifacts
Investigation Tip:
A drop in demand for one industry can cause an increase in demand for another industry. See if you can connect change from one industry to another.
