Which agreement between the united states and japan first addressed the role of japan in korea?

The Taft-Katsura Agreement

Explanation:

The Taft-Katsura Agreement was a 1905 discussion (not an agreement) between political representatives of Japan and the United States regarding the positions of the two nations on the most important issues of East Asia, especially with regard to the state of Korea and the Philippines and the consequences of the Japanese victory in the Russo-Japanese war. It was not an "agreement" and did not establish any new policy, but a memorandum. The memorandum was classified as a secret at the request of the Japanese prime minister, but a scholar discovered it in the archives until 1924.

i would say that the politicial parties from state to state varies.