Expanding your UK business to the United States? This comprehensive guide breaks down the critical differences between UK and US markets, from legal frameworks to business culture. Discover why the US operates more like 50 distinct markets, how employment costs differ (25-40% above base salary vs UK's 15-20%), and what it takes to navigate complex banking, tax, and immigration requirements. Whether you're concerned about salary expectations being 50-100% higher than UK equivalents or managing multi-state compliance, this guide provides actionable insights for successful US market entry.