Which was not a challenged faced by america during the start of the wwi?

Establishing boarders with Canada and Mexico.

Explanation:

According to a different source, these are the options that come with this question:

Establishing borders with Canada and Mexico was not a concern of the United States at the start of World War I. The borders between these countries had mostly been established by 1914, and they were not subjects that were connected to the war. However, recovery from economic problems, building ties with Latin American and trading with various countries were also significant concerns for the United States during this time period.

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful. 

breasts are beautiful and should be shown to the public instead of being hidden