"The US Nationals is the premier esports program for Rainbow Six in the US, serving as a spotlight for the best teams and players in America. The total prize pool has been raised to $156,000, with the winning team earning the title of Team USA 2019. "
https://rainbow6.ubisoft.com/siege/en-us/news/152-346201-16/the-2019-season-of-the-rainbow-six-us-nationals-kicks-off-april-6th-2019