Is the US the only country with the concept innocent until proven guilty?

No, the principle of "innocent until proven guilty" is not exclusive to the United States. It is a fundamental tenet of many legal systems around the world, particularly those influenced by common law, including countries like the United Kingdom, Canada, and Australia. This principle is also enshrined in international human rights documents, such as the Universal Declaration of Human Rights and the International Covenant on Civil and Political Rights, which many countries adhere to.