Instead of building islands they bought, leased, and bullied their way to airbases and islands across the world post WW2. Geography meant building was not necessary.
Hacking? Not sure, there was certainly significant US commercial spying in the early post-war years. They licensed many military techs and broke the terms of licensing, often providing nothing whatsoever in return. Just one example: The Miles M54 and Power Jet's engines, which after very little time and development became the Bell X-1. None at all of the promised data and tech was provided in return. There are others, sometimes by even more dubious means.
Hacking? Not sure, there was certainly significant US commercial spying in the early post-war years. They licensed many military techs and broke the terms of licensing, often providing nothing whatsoever in return. Just one example: The Miles M54 and Power Jet's engines, which after very little time and development became the Bell X-1. None at all of the promised data and tech was provided in return. There are others, sometimes by even more dubious means.