US midterm elections set to reshape Congress and global politics

US midterm elections are underway, with results expected by Wednesday that will determine control of Congress and significantly impact President Donald Trump's political authority and policy agenda. The outcome will shape whether Trump can continue his domestic and foreign policies, with polls suggesting a possible Democratic victory despite historical inaccuracy of such surveys. Three scenarios are possible: a major Democratic win, a split between the two chambers, or a Republican hold. As the world's largest economy, US political decisions have global repercussions. A Democratic win would block Trump's initiatives, a Republican win would empower him, and a split could cause legislative gridlock, affecting international politics for the next two years.