What were the chief priorities of american diplomacy at the end of the nineteenth century?

The protection of the Monroe Doctrine and Open Door Policy from German and Japanese expansion into the Pacific and Asia

Explanation

The Senate that was mainly republican wanted to protect the Monroe Doctrine and the “open door” policy and refused to  interfere more in the European affairs.    

answer; taking up arms to defend the nation;

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.