### Instruction: Classify these MLB teams as either National League or American League teams: New York Mets, St. Louis Cardinals, Los Angeles Dodgers, Arizona Diamondbacks, Tampa Bay Rays, New York Yankees, Houston Astros, Oakland A's
### Response: National League: New York Mets, St. Louis Cardinals, Los Angeles Dodgers, Arizona Diamondbacks
American League: Tampa Bay Rays, New York Yankees, Houston Astros, Oakland A's