What Tekla said is partly correct. But it could be countered that, if the products were any good they would sell anyway.
What is actually happening is that Russia and now China,are buying favour and therefore influence all over the world and America needs to do the same or lose out. China, for example, has enormous investments in Africa. In my wife's home country, there are numerous buildings, sports pavilions, schools, hospitals and such, built with Chinese money and strangely Chinese labour. Some of it, apparently convicts.
Up to the late 80s, it was principally Russia and America, mainly arms and food shipments.
The question for Americans is why? Especially when it is enormously expensive. This is where you will find a major difference.
One side will argue that America needs to maintain influence to maintain it's security, not to mention its markets and supplies.
Others will point out that America doesn't have any problems with its external security, it's uninvadable, that it's markets are insignificant if they need to be maintained artificially and it doesn't need supplies.
But it's good that you can be so reasonable about it, especially when it amounts to many Americans paying more taxes than the UK taxpayer.