its surplus exports from the United States, which

[suprunp]

In return for supporting the Allies, the Ortiz administration had sought guarantees for its surplus exports from the United States, which supplied most of Argentina's manufactured goods. But Ortiz was unable to get what the Argentinians considered a fair deal from the United States, and during the Castillo regime Argentina's ultranationalists looked to Germany as a potential new market for Argentine exports and as a military supplier.
(Jon Lee Anderson; Che Guevara: A Revolutionary Life)

It seems to me that 'which' goes to 'the United States' here.

Is it possible to make 'which' refer to 'exports' without changing the first part of the sentence, for example:

In return for supporting the Allies, the Ortiz administration had sought guarantees for its surplus exports from the United States, which were crucially important for Argentina's economic growth.

Or should it be slightly changed in order to be more clear:

In return for supporting the Allies, the Ortiz administration had sought guarantees from the United States for its surplus exports, which were crucially important for Argentina's economic growth.

Thanks.

[SoothingDave]

Your last sentence makes it seem like it is the United States' exports that you are talking about.