Big Data has significantly aided Taiwan and the United States in their efforts to identify, contain, and allocate resources during the COVID-19 pandemic, proving to be a crucial tool in protecting public health. Taiwan, leveraging its National Health Command Center (NHCC) established post-SARS, utilized extensive databases for swift action, integrating national insurance and immigration data to track and manage the virus's spread effectively. By implementing QR code technology to monitor travelers' health and movement, Taiwan ensured efficient containment and resource allocation. Simultaneously, the United States, under President Donald Trump, collaborated with private companies to enhance case identification through online testing initiatives, utilizing geolocation technology for targeted testing and tracking. Both countries demonstrated rapid technological deployment, with Taiwan and the U.S. taking just 72 and 24 hours, respectively, to develop new systems, reflecting the importance of data and collaboration in crisis management. Taiwan's proactive measures earned high public approval, showcasing the effectiveness of data-driven strategies in combating the pandemic.