When it comes to innovation, creativity and discovery, the US has always been fertile terrain and houses some of the world's most powerful and influential tech firms. These 10 firms are at the avant-garde in technological advancement; 10. Xerox 9. Cisco Systems 8. Qualcomm 7. Oracle 6. Hewlett Packard Enterprise 5. Intel 4. Alphabet (Google Parent Company) 3. Apple 2. IBM 1. Microsoft