Who cares what "Trump" loses? This is about the USA and Trump will be long gone before any of these situations are measured. The USA is not starting a trade war with Iran (first time I've ever heard sanctions called a trade war), the US is enacting sanctions to hurt Iran without scaring allies like Saudi Arabia.
> China holds far more US debt than Americans hold Chinese debt
That's intentional and good for the US. If you don't understand this, I really think you need to understand why we sell it to foreign powers at all.
> China has far more market reach into emerging markets in Africa
That's a real problem which the USA is losing out on potentially. It won't be apparent for some time, since people who are industrialized enough to get out of self-oppressive warlord control will not handle foreign occupation very well either. The US answer is always to enable the counter-revolutionaries anyway until the US has someone they want to deal with.