After Russo-Japanese War, relations between Japan and the United States had been strained due to such issues; naval armament, Japanese immigration exclusion, and the Open Door policy toward Manchuria. In particular, so-called Japanese immigration issue had the singularity, because it might had isolated Japan who had acknowledged herself to be a major power as European nations. In October 1906, the decision of San Francisco School Board to segregrate all Japanese, Chinese, and Korean children from other students to a special Oriental Pulic School had extended a serious diplomatic problem between two Nations, and given rise to the War Scare in the U. S. by yellow journalism.
At that time, by not any treaty but the Gentleman's Agreement, Japanese government self-restricted of issuing the passport to it's labors for the U. S. and concluded Root-Takahira Agreement in order to soothe this War Scare.
Otherwise, While President Theodore Roosevelt had solved Japanese immigration issue peacefully through enacting new Immigration Law in 1907 and negotiating with Japanese government, he had made use of this crisis to his policy of increasing naval power. For example, although world cruise of U. S. White Fleet was evidently the militalistic demonstration to Japan, the necessity of strong navy in the emergency was impressed certainly to the American citizen. The analysis by Japanese navy that the cruise would had reinforced the U. S. naval power came true. In December 1907, Roosevelt recomended to construct four battleships to the Congress, the Naval Appropriation Act of next year authorized his plan in part, and appropriated $900, 000 to establish a naval station at Pearl Harbor, Hawaii.
Next administration of William H. Taft made progress of laying down dreadnaught or super-dreadnaught type battleships more vigorously than the former. As well, Kincho-Aigun railway project and the suggestion to neutralization of railways in Manchuria, in other words “Diplomatic Policy by Dollors” was the challenge to Japanese special interests.
In the Imperial Defence Policy of 1907, although it seems to be not imagined that Japanese immigration issue would caused to be the war against the United States, the U. S. was stood first in it's main enemies for Japanese navy, this viewpoint led to the grand military designs of establishing the ambitious 8:8 Naval Ratio. But, Japanese naval power was declined extreemly by the above completion of U. S. navy, Japanese navy regarded it's decline and U. S. expansion toward Manchuria as the crisis of it's national security and special interests. Thus, Japanese navy had aimed to reconstruct of itself, required Japanese cabinet to the appropriation for laying down battleships and naval installations.
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