By Andrew McCarty The World Athletics Championships have been dominated by American athletes over the past two night. On Thursday night, Noah Lyles set an American record in the 200-meter dash when he posted a 19.31. That broke Michael Johnson’s 19.32, which he posted over 25 years ago. Come Friday night, it was time for another record to go down. Star hurdler Sydney McLaughlin exploded out of the blocks and down the back straightaway in the 400-meter hurdles. She held the lead before the 200-meter mark and never looked back. By the end of her race, McLaughlin had posted a 50.68, becoming the …