I am looking for a poignant statistic to show how much impact U.S.
businesses are involved with the development of other nations. For
example, number of companies overseas that operate because of U.S.
business; the number of people employed through those companies; the
amount of GDP in other countries that U.S. business operations are
responsible for.

I don?t have specific statistics to show how much USA contributes to
the development of other nations but I do have a logical comment. USA
being a world power in the business world and having most of the
largest enterprises in the world then it must have a large impact on
foreign nations. If you take a look all the largest business in other
nations are mainly US based. Coca-Cola, Microsoft, DHL are all
businesses that operate internationally. Even though they are US based
and operating in other countries, they can be considered as the
largest business in the country they are operating in. this in tern
leads to more jobs for the country and a higher GDP.