According to the German Embassy in Washington DC:
Nearly 43 million people - about 15% of respondents to the 2000 US Census - listed German as their primary cultural heritage, making German the most frequently cited ethnicity in the US.
Direct German investment worth $148.8 billion by the end of 2003 created 800,000 jobs in the US. At the same time, US investment worth $80.2 billion provides almost 500,000 jobs in Germany.
[…] Germany is the second top foreign R&D [Research and Development] location for American firms, who spend roughly $3.6 billion (in 2002) in R&D.