 He says it's more cost-effective and efficient for the patient instead of ordering a myriad of tests to try and figure out how to treat an issue. The German American Heritage Center Museum in Davenport will be named a new silos and smokestacks National Heritage Area on Tuesday. Spokeswoman Jory Wade Booth says the thousands of German immigrants who came in the 1860s played a significant role in helping Iowa to develop as an ag powerhouse. A lot of people think of agriculture inside a box.