How did the European system of spheres of influence in China threaten U.S. Interests?

Answer 1

It limited the number of port for the united states in china

Answer 2

The European system of spheres of influence in China threatened U.S. interests because it marginalized American access to Chinese markets and resources. The United States feared that it would be left out of the economic and territorial carve-up in China, which would limit its ability to expand trade and exert influence in the region. Additionally, the U.S. saw this as a threat to the principles of free trade and open diplomacy, which were important elements of American foreign policy at the time.