Although Donald Trump and President Xi recently announced a trade agreement between the US and China, some believe 5G mobile networks might yet spark a further ‘trade war’. These mobile data networks will be rolled out commercially over the next decade, preparing the way for driverless cars and smart cities. Some say 5G technology, 100 times faster than today’s connections, could be a bigger leap forward than the original internet, and countries using it successfully will dominate 21st-century trade and commerce. Whoever builds and controls the new networks will take on huge political and economic importance. The US now wants to stop Chinese technology companies from taking a lead in this field. China is racing to gain a head start in these new technologies, and views 5G as potentially the key to 21st-century superpower status. See also UK article 3.