This Review provides a concise overview of a comparative review exploring entrepreneurial ecosystems in the United States and their counterparts in Europe. The examination seeks to identify key characteristics, strengths, and challenges within these ecosystems, shedding light on the factors influencing entrepreneurship on both sides of the Atlantic. The entrepreneurial landscape in the United States has long been considered a global benchmark, characterized by a dynamic ecosystem that nurtures innovation, risk-taking, and venture capital. This review engages in a comparative analysis, juxtaposing the American entrepreneurial ecosystem with models prevalent in Europe. It delves into the structural elements, support mechanisms, and cultural factors that shape and differentiate these ecosystems. In the USA, a robust ecosystem is marked by a convergence of factors such as world-class universities, a prolific venture capital landscape, and a culture that embraces risk and failure as integral to the entrepreneurial journey. The review scrutinizes how these elements contribute to the rapid formation and scaling of startups, fostering a culture of innovation and resilience. Contrastingly, European entrepreneurial ecosystems exhibit a diverse range of models influenced by regional variations in culture, regulatory environments, and historical contexts. The analysis probes into the strengths and challenges inherent in these ecosystems, exploring how they navigate issues such as access to capital, risk aversion, and the balance between innovation and regulatory frameworks. The comparative review aims to distill insights that can inform policymakers, entrepreneurs, and stakeholders on both sides of the Atlantic. By understanding the nuances of each ecosystem, the goal is to identify transferable best practices, foster cross-cultural collaborations, and contribute to the evolution of more resilient and globally competitive entrepreneurial environments. In summary, this review illuminates the distinct characteristics of entrepreneurial ecosystems in the USA and Europe, offering a comparative lens to understand the intricacies that drive innovation and economic growth. As the global landscape continues to evolve, this review serves as a valuable resource for shaping policies, fostering collaboration, and advancing the collective understanding of what propels successful entrepreneurship in diverse and dynamic contexts.
 Keywords: Entrepreneurial, Ecosystem, European, Models, Policies.