premise: Virginia exports only crops.
hypothesis: Virginia . Virginia 's economy has many sectors : agriculture in the Shenandoah Valley ; federal agencies in Northern Virginia , including the headquarters of the U.S. Department of Defense and Central Intelligence Agency ( CIA ) ; and military facilities in Hampton Roads , the site of the region 's main seaport . Virginia 's economy changed from primarily agricultural to industrial during the 1960s and 1970s , and in 2002 computer chips became the state 's leading export by monetary value .