It a sign of globalization and hyper specialization which enabled the prosperity the world has had over the last 80 years

It meant that smaller nations could specialise in skill sets such as the UK with finance and Germany with high quality manufacturing

If they bring everything in house everything more expensive because nations won't be masters in one skill but a jack of all trades

The USA is big enough that things would be more expensive but life would still stay the same

In a worce case scenario people living in third world countries have a billion dead due to famine

Their are nations that are geopolitically loses but have advantages due to globalization dissolving geopolitical barriers

Now due to the breakdown in the American led order geography starting to matter again

If it was not the destructiveness of modern warfare the international environment would already be having Nations

Marching to war