If there is a war between the US and Europe, Bitcoin will hit $1 billion
Most of the world's banks, whether big or small, are located in the US and Europe, In case of war, all banks will be closed, Which will immediately benefit Bitcoin, The price of bitcoin will increase infinitely, Many banks will quickly print dollars and euros to buy cryptocurrency quickly, This will have a huge impact on Bitcoin as there will be no other source for cross-border transactions. Remember that most of the world's banks are located in the US and Europe, while 20-25% of them operate in Asia and other regions.
I don't think Bitcoin will reach $1 billion. It must first hit $100,000 before moving on to $1 million. I can't image what the market cap will be if the price ever reaches $1 billion. I recall what occurred to the FX market when there are natural disasters or wars, which have a large impact on the market as well as in crypto, either positively or negatively . People will undoubtedly take advantage of the circumstance. However, there is a very minimal probability of a US-EU war occurring because there is no logical reason to do so, and doing so would be a waste of their resources.