The UK and US have signed a $42 billion "Tech Prosperity Deal" during President Trump's state visit, focusing on AI, quantum computing, and nuclear energy cooperation. Major investments include Microsoft's $27 billion for AI infrastructure and Nvidia's deployment of 120,000 GPUs across Britain. The partnership aims to accelerate healthcare innovation, advance clean energy, and create over 5,000 high-skilled jobs. UK Prime Minister Starmer called it a "generational step change," while both nations position the deal as strengthening their competitive edge in global technology development, particularly against China.