The United States (and via extension, Japan) adopted a favorable trading relationship with Korea.
Sometimes the US wants to strip-mine a country of its natural resources and use it as a source of cheap labor, in which case it will not adopt a favorable trading relationship. This makes export oriented industrialization an uphill battle.
Sometimes it wants to build up its industry so that it is militarily self sufficient. Japan and Korea fall into the latter camp.
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The United States (and via extension, Japan) adopted a favorable trading relationship with Korea.
Sometimes the US wants to strip-mine a country of its natural resources and use it as a source of cheap labor, in which case it will not adopt a favorable trading relationship. This makes export oriented industrialization an uphill battle.
Sometimes it wants to build up its industry so that it is militarily self sufficient. Japan and Korea fall into the latter camp.