Look out, Starbucks: Luckin Coffee, the biggest coffee chain in China, is opening its first U.S. locations

The outside of a Luckin Coffee (Credit: CFOTO / Future Publishing—Getty Images)

• Luckin Coffee is opening its first U.S. locations. The China-based coffee chain has grown to outnumber Starbucks in its home country. It enters the U.S. market at Starbucks is in the midst of a turnaround effort.

While the trade wars are capturing most of the headlines, another battle is brewing between China and the U.S. over consumer caffeination.