Accurately determining how much of our economy's total manufacturing production is American-made can be a daunting task. However, data from the Commerce Department's Bureau of Economic Analysis (BEA) can help shed light on what percentage of the manufacturing sector's gross output is considered domestic. This report works through several estimates of how to measure the domestic content of the U.S. gross output of manufactured goods, starting from the most basic estimates and working up to the more complex estimate, domestic content.