How did the government justify the chinese exclusion act?

by saying that Chinese immigrants threaten the safety of the United States

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.

there is no chart here so no one can answer this.