<< During US imperalistic age, the people in the Philipines rebelled against Japan I think. The US helped them out. I could be wrong, and I probably am. >>
Not even close on both counts. The Philippines were Spanish-controlled until 1898-99 when the US occupied them during the Spanish-American War. A revolution broke out and it was repressed by the US by 1900 (during an aggressive colonial expansionist period by the US). The islands were US territory until their independence in 1946 (the years 1942-1945 being an exception, the Japanese occupied the islands after forcing out MacArthur aroud Christmas Day 1941.
<< Pearl Harbor was also owned by Japan prior to US taking it. >>
Pearl Harbor was NEVER owned by Japan. The Hawaiian Islands were a kingdom ruled by a native monarch (the last one was Queen Lilio-something, I could never spell it without looking it up). In 1893 (I think was the year, it was the mid-1890s at any rate), American pineapple and sugar planters led by Sanford Dole (you've heard of Dole pineapple, that's the guy) overthrew the monarchy. They petitioned to become part of the US but Cleveland didn't feel it was right for America to become imperialist. Dole became prime minister of Hawaii, letting the queen continue in a role similar to QE2 today if i'm not mistaken. Finally in 1899 the United States annexed Hawaii, Hawaii becoming a state in 1959. At no time did the Japanese own Pearl Harbor or any Hawaiian territory. The reasons why Japan attacked Pearl Harbor are varied, but seeing as Japan needed to fight the US eventually to set up it's Greater East Asia Co-Prosperity Sphere (Japanese gvt's name for the Pacific Empire they were attempting). They decided destroying the Pacific Fleet unannounced was the best way to open the inevitable hostilities. The immediate reason we were attacked was that we had restricted raw materials such as oil from going to Japan--Japan was getting deperately low on oil and needed to get some quick--that was the short-term reason for the attack, or it's timing at least. If anything i have said here is erroneous, I apologize profusely, this is just what i remember from AP American history and my econ teacher's explanation (he has a history degree too).