How did the european system of spheres of influence threaten u. s. interests in china a. it blocked american troops from quashing the rebellion in china. b. it increased chinese immigration to the united states. c. it prevented the united states from gaining colonies in asia. d. it limited the ports for american trade in china.

The correct answer is option D. " It limited the ports for American trade in China". The system of spheres of influence is the phenomenon of one or more Nations intervening in the affairs of others countries. In this case European countries limited the ports for United States trade in China, in an effort to limite America and China expansion.

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.

a direct vote in which an entire electorate is invited to vote on a particular proposal. this may result in the adoption of a new law.