Over time, the geographical distribution of trade between the United States and its main Asian partners changed. In the 1970s, Japan dominated trade between Asia and the United States. With minor changes, the same pattern remained up to the early 1990s (see Figure 4). B. The emergence of “Factory Asia”: When supply meets demand
While it could be from literally anywhere, I'd assume most of them came from the Soviet Union, Germany, France, and Poland, along with plenty of other smaller countries like Austria, Hungary, and even Greece.
