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Here are some more accurate figures as to what U.S. companies are investing in China and Mexico:

By the end of 2002, China has approved 37821 U.S-invested companies, with contractual volume of 78 billion USD, making U.S. the biggest FDI inflows of China. U.S. investment not only involves in manufacture industries , but also in tertiary industry.
Meanwhile, Chinese investment in U.S. is also very active. At present, near 1000 Chinese companies including stated-owned and private companies have been setting up in the U.S. with a total value of 1 billion. (source)

U.S. firms are major investors in China and in 1998 actual U.S. investment in China rose to almost $4 billion,(source)

During the 1995-7 period, U.S. direct investment in Mexico grew by 27%, and in 2000 nearly $9 billion of the approximately $13.2 billion of foreign investment that entered Mexico came from U.S. corporations (source)