I am writing about the success and failure of foreign car companies in the US market. Why did Fiat and Renault pull out of America in the 1980s, despite success in the late-1950s? Why did South Korean carmaker Kia, who only entered the US market in 1992, outsell Chrysler in 2009? How did Volkwagen, which had almost 6% of the US marketshare in 1971, fall to a half-a-percent in the early 1990s?