In the border state of Arizona, a new law known as SB1070 has reignited the immigration debate across the US. It's 2010, and the Tea Party-backed politicians responsible for the law say President Obama's failure to seal the border has forced them to take matters into their own hands to defend the state against illegal immigrants that the tanking economy cannot afford. But opponents of SB1070 say it criminalizes undocumented people and legitimates racial profiling of the state's large Latino population. The Obama administration challenged the law in court, arguing that it usurps federal authority over immigration - and a federal judge temporarily blocked some of its most controversial provisions from being implemented. Meanwhile a movement is rising, challenging not just SB1070, but the very premises of federal immigration policy. Fault Lines' Josh Rushing travels to the epicenter of the country's broken immigration system and asks the questions that are fracturing the nation: What does it mean to be illegal? And what does it mean to be American?