Treating foreign businesses on equal footing to domestic ones is a recent phenomena. Historically the US has leveraged trade policy to block foreign enterprise through the use of tariffs during periods of instability ( reconstruction ) and to protect early industries ( Pennsylvania steel industry in the mid-1800s ).

https://en.wikipedia.org/wiki/Tariff_in_United_States_histor...

In the event that a country lacks a comparative advantage sufficient to balance trade and maintain local employment and economic growth; Then some degree of trade restriction is useful to ensure both stability and future growth. At 15-20% local unemployment, losing the perceived future growth engine(s) of the economy to foreign competition would not be politically acceptable to a majority of Americans.

How this plays out in the digital age is interesting. Tariffs are largely ineffective due to the nature of services. China has successfully grown a domestic tech industry from 0 - FANG equivalent by blocking all foreign competitors. It will be interesting if the EU seeks a similar strategy to grow its tech sector.