The book discusses the upcoming world order from a geopolitical perspective and gives original insight into potential developments. For example, I wasn't aware the US Navy has been securing the maritime shipping lanes, thus boosting global trade; and if that stops, well, you can imagine the implications.
[1] https://www.amazon.com/Disunited-Nations-Scramble-Power-Ungo...
A major reason of the ability for the US to do this is energy self sufficiency.
https://www.amazon.com/dp/0062913689/ref=cm_sw_r_cp_awdb_imm...