@Emperor:
Call them whatever you want Superpower, Great Power, Global Power, Empire, the Spanish-American war marked the rise of the US as one, and removal of Spain from the category. The creation of the country Panama and the building of the Panama canal is a testament to the US’s new status.
Prior to WWII I would classify the Super Powers as US, UK, Japan, and to a lesser degree France. Notice I do not include Russia, Germany, Austria-Hungry, or the Ottoman Empire. I condisder these regional powers, only the first group had the capability to project power far beyond their shores. I would argue that even after WWII the Soviet Union did not deserve the title of Super Power, it would have been hard pressed to conduct a major military campaign far beyond it’s borders. Even a campaign in next door Afghanistan proved too much for them.
I like your definitions, they make a lot of sense to me. Yes, the USA would have been a super power at 1898 as demonstrated by the Spanish-American war (where America projected power across the globe; Puerto Rico, Cuba, Philippines…)
Would the opening of Japan by the Americans in 1853 as an example of actions by a superpower have counted do you think?
http://en.wikipedia.org/wiki/Black_Ships
Under your hypothesis, when was the USA a regional power? I would guess at the Adams-Onasis treaty of 1819 where Spain gave up claims to Florida and Oregon, simply because the USA wanted these.