sentences:  Much of the infrastructure built during that time remains today—including Montpelier's historic Carnegie Library and many of Hartford City's buildings in the Courthouse Square Historic District.Agriculture continues to be important to the county, and became even more important after the loss of several large manufacturers during the 20th century.Today, 72 percent of Blackford County is covered by either corn or soybean fields; additional crops, such as wheat and hay, are also grown.