The correct answer is shared political ideals. This is because national identity in America is not primarily based on ethnic kinship or religion, as the country is known for its diverse population. Additionally, while a common language may contribute to a sense of unity, it is not the main foundation of national identity. Instead, Americans often identify with their shared political ideals, such as democracy, freedom, and equality, which are central to the country's founding principles. Federal law, while important for governance, does not define national identity in the same way as shared political ideals.