It seems obvious to think that any company wants to get rid of paying more taxes for a product now than a few months ago and more if they are imported from other countries, which means tariffs of up to 25%. At Apple they want their Mac Pro to get rid of these taxes established by the current government of the United States, led by Donald Trump.
In this case it happens that The Mac Pro will be manufactured entirely in the Asian countryQuite the opposite of what happened with the 2013 Mac Pro (the trash can) that was assembled in Yankee territory, specifically in Texas. In Cupertino they want these tariffs imposed by Trump to affect neither the final price of the product nor their economy, so they are fighting to try to get rid of these extra payments.
Finally, the government is the one who has the last word on this matter but Apple has about 15 requests for Trump to back down and they can lower the cost of a product that is already expensive. This obviously affects the final price of the equipment and not only Apple's, all companies will be affected by these tariffs imposed by the United States on products arriving from China.
The idea that American politicians have is that you all already know how to promote the national product and that companies produce and manufacture the maximum number of components and equipment in the country, but that has a much higher price than doing it in countries like China and that is why This is the commotion that arose these months ago. In addition, the most basic model of the Mac Pro is the one that costs a whopping $ 6.000, which is why Apple's insistence that Trump eliminate the tariff at least for these teams and their components.