When american buy german cars, americans are _ these cars

when American buy German cars, Americans are Importing  these cars

Explanation:

When an American buy a good or a service from any other country on earth the American Consumer is importing the good or service bought.

The import is the purchase of a good or a service that is not produce locally. While the export is the contrary, meaning the selling of a product or a service in another country different than the local.  

The difference between the total amount of money spend in exports less the total amount of money invest in imports is called the Trade balance. This is an important component of the Gross Domestic Product, which is an index that measures the development of a given economy.