In a speech to the nation Thursday evening, President Donald Trump said Americans deserve secure elections, and he claimed to be using federal authority to prevent them from being “stolen.” In fact, one of the strongest security features of U.S. elections is the fact that they aren’t conducted at the federal level. America votes in more than 10,000 different election jurisdictions, each with different rules set by state and sometimes local governments. That structure makes the nation’s elections extraordinarily complicated — and also safe from widespread fraud. While differences in election laws can get confusing, election security experts say this structure is a strength.