CHICAGO — In the spirit of the the Fourth of July, Cars.com has unveiled its semiannual American-Made Index, which ranks the most-American vehicles based on percentage (by cost) of parts made domestically, location of vehicle assembly and how popular each car is with U.S. buyers. For the fifth time in a row, Ford’s F-150 has claimed the top spot on the list.

In addition, Ford was chosen by consumers as the most-American automaker, according to a recent survey conducted by Cars.com. In the survey, 49 percent of respondents perceived Ford to be the most-American manufacturer. Chevrolet ranked a distant second, with 29 percent of participants calling it the most-American automaker. In keeping with consumer perception, vehicles from Ford and Chevrolet’s parent, GM, comprised more than half of this year’s American-Made Index.

Consumer attitudes about domestic versus foreign cars made their choices vary greatly, according to the same Cars.com survey. While most say their buying habits aren’t influenced by where a car is made, 27 percent of consumers said they would only consider buying American-made vehicles, and 9 percent would only consider foreign-made cars.

“In today’s global economy, decisions about buying ’American-made’ products can be easily clouded,” said Patrick Olsen, editor-in-chief of Cars.com. “Most cars built in the U.S., for example, are assembled using at least some parts that come from somewhere else. Cars.com’s American-Made Index helps consumers identify the most-American vehicles based on production location, percentage of domestic parts content, and American sales volume for each vehicle.”